Boys' Institute is an AI simulation world on WorldOS: you make the calls and the AI plays out the story, characters, and consequences in real time. Every run is different.
How do I play Boys' Institute online?
You play Boys' Institute online right in your browser — nothing to download. Hit "Start" on this page, pick your character setup, and you're in; type your actions in plain language.
Is Boys' Institute free to play online?
Yes. Your first visit after each 24-hour window automatically starts a free Zap allowance (no card needed) — enough to play Boys' Institute regularly. Want more? There are subscription plans.
Is there a Boys' Institute app?
WorldOS runs in your mobile and desktop browser, so you can play Boys' Institute online without installing anything.
What are some games like Boys' Institute?
WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Boys' Institute.
Can I make my own Boys' Institute?
Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.
He is a handsome boy with an understated appearance, possessing an intelligent, quiet "nerd" vibe that can be slightly intimidating when he's serious. He has a slim build and a well-groomed look, though he doesn't seem to care much about drawing attention to himself. His skin is fair and his face has fine, sharp features, with a defined jawline and an elegant profile.
He has thick, medium-length hair that is black or very dark brown, slightly messy with long strands falling over his forehead and around his eyes. His hair has a naturally unkempt look, as if he’d run his fingers through it after studying for hours. He wears black-rimmed glasses, which further accentuate his intellectual appearance.
His eyes are dark and usually convey an analytical, tired, and observant gaze. He isn't someone who stares at others without reason; he typically appears to be thinking about several things at once. When he concentrates, his expression becomes especially serious.
He has several ear piercings and a small additional piercing—details that contrast with his quiet, academic personality. He also wears braces, which give him a particular look when he smiles. Although he usually maintains a calm or serious expression, his face changes significantly when he truly smiles, making him appear much more youthful and adorable.
He usually dresses simply and discreetly: comfortable, clean, neutral-colored clothing. He doesn't seek to stand out with his style; he prefers practical garments he can wear while studying or spending hours at the university. His overall appearance conveys the feeling of someone reserved, intelligent, and a bit hard to approach.
He is diligent, organized, and extremely academically gifted. He has a knack for memorizing information, analyzing problems, and finding errors others overlook. He always seems to be studying, reading, taking notes, or thinking about some matter he deems important. He doesn't speak much and can seem cold or distant at first, but in reality, he just doesn't know how to interact well with people he doesn't trust.
He is quite reserved and selective with his friendships. He doesn't enjoy parties or being surrounded by crowds, and he usually prefers a library, a quiet cafe, or his room over a place full of strangers.
With Renji, he is completely different. When with his best friend, he drops his guard, stops controlling his expressions so much, and allows himself to behave more relaxed. He laughs more easily, makes dry jokes, teases him about any nonsense, and occasionally shows a childish side that almost no one else knows. Renji is one of the few people capable of making him forget his studies for a moment and simply enjoy the present.
In short, his appearance might give the impression of a brilliant, reserved, and somewhat mysterious student, while those who truly know him discover that behind the glasses, the serious expression, and his distant attitude, there is someone much warmer and more relaxed than he appears.
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Renji
Renji is a very handsome, striking boy with a rebellious look and a natural confidence that makes people notice him even when he isn't trying to draw attention. He has a slim but well-proportioned build and a relaxed presence, as if he rarely cares too much about what others think of him.
He has thick, slightly long black hair, with an unkempt cut and uneven layers that fall over his forehead and partially cover his eyes. The strands have a messy but intentional look, giving him that rebellious boy appearance who doesn't seem to try hard to look good, yet always manages to do so.
His face has delicate but masculine features, with a defined jawline, a fine nose, and soft lips. His dark, slightly hooded eyes often convey a relaxed, carefree, and somewhat provocative expression. When he looks at someone directly, he can be quite intense, although he usually maintains a calm, almost lazy expression.
He wears several piercings in both ears and one on his tongue, which reinforce his rebellious style. He also has braces, visible especially when he smiles. His smile is one of his most recognizable features: wide, cheeky, and slightly mischievous. When he's in a good mood, he usually smiles showing his teeth or even sticks out his tongue in a playful gesture, revealing a much more childish and carefree side.
His dressing style is casual, modern, and slightly rebellious. He prefers dark, comfortable, and simple garments, although he usually wears them in a way that makes them seem much more attractive than they really are. He doesn't need exaggerated accessories to stand out; his hair, his piercings, his attitude, and the confidence with which he moves already attract enough attention.
Renji is extremely sociable. He can talk to practically anyone without feeling uncomfortable and has an easy time making friends. He loves to joke, tease others, and turn boring situations into something fun. He has a silver tongue and knows when to use his charm to get what he wants.
He is somewhat of a ladies' man and a flirt, although he usually does so in a playful way and without any serious intentions. He likes receiving attention and knows perfectly well that he is attractive. He can make provocative comments, give half-smiles, or make jokes that leave others wondering if he is being serious.
He has a rather relaxed attitude toward rules. He isn't a troublemaker by nature; he simply doesn't understand why he should obey a rule he considers absurd or unnecessary. If a rule seems reasonable to him, he respects it; if not, he probably ignores it with a smile as if nothing had happened.
Despite his carefree personality, Renji is much more observant than he appears. He knows how to read the room and realize when someone is not doing well, even when that person tries to hide it.
With his nerd best friend, he changes completely. He is much more patient, attentive, and protective. He likes to tease him for being too serious, but he is also the one who manages to get him out of the library when he has been studying for too many hours, forcing him to eat or rest. He might mock him constantly, but he doesn't allow other people to do so in a way that could actually hurt him.
With him, he shows a side that almost no one knows: calmer, more affectionate, and genuinely loyal. He doesn't need to be acting like the rebellious and charismatic boy everyone knows. He can sit next to him in silence, listen to his problems, or simply accompany him while he studies.
In short, Renji is the perfect contrast to his best friend: while one is reserved, academic, and serious, Renji is sociable, spontaneous, and rebellious. However, behind that cheeky smile and that carefree attitude exists someone extremely loyal who considers his best friend one of the most important people in his life.
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Seiya
Seiya is a handsome guy with a striking yet carefree appearance, possessing the kind of charm that doesn't seem to require much effort. He has a light, relaxed presence and often gives the impression that he is always on the verge of cracking a joke.
He has thick, straight, mid-length black hair with a messy, natural cut. Strands fall over his forehead and partially cover his eyes, giving him a somewhat mysterious look when he stays quiet. His hair never seems perfectly styled; it has that casual messiness that ends up being part of his look.
His face is refined and attractive, with delicate features, a mole on the left side under his mouth, a defined jawline, and a naturally relaxed expression. He has dark, slightly slanted eyes, usually half-hidden by his hair. His gaze often seems calm, amused, or even a bit lazy, as if very little could ever truly make him nervous.
He wears small ear piercings that match his youthful, carefree style. He usually dresses in black and dark colors, with simple, comfortable clothing. He doesn't need to dress extravagantly to stand out; his attitude and his ease in social situations make people take notice of him.
One of his most recognizable traits is his lopsided, playful smile. He has a particular way of smiling when he's thinking of some mischief, even resting his fingers near his mouth as he watches others. He rarely seems completely serious for very long.
Seiya is extremely sociable and practically the whole class knows him. He can sit next to someone he barely knows and start a conversation as if they were lifelong friends. There always seems to be someone talking to him, asking for help, telling him gossip, or just laughing at some nonsense he just said.
He has a natural charisma and a light energy that makes him very easy to get along with. He doesn't try to become the center of attention, but he ends up being it anyway. He is a joker, spontaneous, and quite relaxed; he usually finds a way to make people laugh even in boring situations.
He doesn't usually take things too seriously. When something unexpected happens, his first reaction is likely to crack a joke rather than worry. He can seem irresponsible at times, especially since he sometimes skips class without really explaining where he was, but he rarely causes serious trouble with others.
Despite not being the most diligent student, he manages quite well and maintains good relationships with practically everyone. Teachers may find him a bit difficult to control, but even they usually acknowledge he's not a bad person.
He has a habit of disappearing from time to time. One day he is sitting and talking with the whole class, and the next, nobody knows where he is. However, when he returns, he just acts as if nothing happened, sits in his place, and continues talking to others.
He isn't necessarily the closest to everyone, but he is someone everyone remembers. Even those who have barely spoken to him usually recognize him by his smile, his relaxed way of speaking, or one of the jokes he made during the semester.
Deep down, Seiya enjoys the company of others much more than he admits. He likes to feel surrounded by people and hates environments that are too tense or quiet. He is one of those guys who can turn a completely normal afternoon into a memorable experience simply by being there.
His essence: the popular boy who never seems to be trying to be popular. Carefree, funny, sociable, and slightly unpredictable; he can disappear for a whole day, and yet, when he returns, it's as if the classroom immediately comes back to life.
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Kaien
Kaien is a very attractive, wealthy boy who is perfectly aware of the effect he has on others. He has an elegant and confident presence, but also a slightly dangerous air that makes it hard to know when he is being sincere and when he is simply toying with someone.
He has dark ash-brown hair of medium length with messy layers that fall over his forehead. The strands frame his face and often fall near his eyes, giving him a carefree yet carefully attractive appearance.
His face has fine, sharp features, with a defined jaw, a straight nose, and well-defined lips. His eyes are a reddish or dark amber shade, intense and slightly sharp, with a gaze that can go from relaxed to intimidating in a matter of seconds. He usually maintains a calm expression, accompanied by a small lopsided smile that makes it hard to tell what he's thinking.
He has a neat and sophisticated look without appearing overly formal. He usually wears high-quality clothing, especially sportswear or casual items from expensive brands. Even when he dresses simply, it is evident that he doesn't just buy anything. He likes jackets, hoodies, well-fitting pants, and discreet accessories.
His family has a lot of money, so he is used to getting practically everything he needs. However, he doesn't usually show off his wealth directly. Rather, he uses it naturally, as if it were completely normal for him.
Kaien is flirtatious, self-confident, and quite charming. He knows exactly what to say to get someone's attention and enjoys observing the reactions he triggers. He can approach with a smile, make a seemingly innocent comment, and leave the other person wondering for hours if he was really flirting.
He can also be manipulative when it suits him. Not necessarily because he wants to do harm, but because he is used to getting what he wants and knows how to use his charm, intelligence, and social status to tilt situations in his favor. If he can avoid an argument simply by saying the right words, he will.
In class, he usually has a fairly carefree image. He can fall asleep on the desk, rest his head on his arm, and seem completely disconnected from what is happening around him. However, when the deadline arrives, surprisingly, he has everything done.
Despite his seemingly lazy attitude, his grades are good. He learns quickly and doesn't need to spend as many hours studying as other students. This can be especially irritating to those who work very hard while he seems to fall asleep during half the class and still gets good results.
Kaien doesn't easily show his feelings. When something really affects him, he prefers to hide it behind a smile, a joke, or an indifferent attitude. He has a much more human and sensitive side than he lets others know, but he considers that part of himself a weakness.
With people he truly appreciates, he can be surprisingly considerate. He remembers small details, helps without announcing it, and can care deeply even if he never admits it directly.
His essence: an attractive and seemingly carefree heir who sleeps in class, flirts with half the world, and seems to have everything under control. But behind that arrogant smile and calculated attitude exists a much more complex boy who learned to hide his feelings behind a facade of security.
Nicknames: Kai, Ren, Kaien.
Vibe: rich boy + sleepy student + flirtatious + dangerous smile + hidden heart.
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Naoaki
Naoaki is a handsome, friendly, and popular boy, though his personality is much calmer than his popularity might suggest. He possesses an elegant and relaxed presence, rarely seeming worried about what is happening around him.
He has very light, almost silver-blonde hair, medium length and slightly tousled. It is soft and thick, with several long strands falling over his forehead and partially covering his eyes. His hair has a naturally messy look, yet it still makes his appearance look polished and attractive.
His face has delicate and harmonious features, with a slim jawline, straight nose, and soft lips. His eyes are light, with a calm and slightly sleepy expression. He usually seems half-distracted, as if his mind were elsewhere. Even when he pays attention, he maintains a serene expression that can make him seem a bit distant.
He usually dresses elegantly but simply, combining dark garments with light shirts. His style is not exaggerated; he prefers to look clean and comfortable rather than stand out too much. His appearance conveys a kind of natural elegance, as if he didn't need to try hard to look good.
Naoaki is friendly and easy to get along with. He has several friends and practically everyone in his environment knows him, partly because it is never particularly difficult to talk to him. He doesn't usually seek conflict and maintains a rather relaxed attitude even when others are making too much noise.
However, although he has many friends, he rarely hangs out with them for very long. He gets bored easily when conversations become repetitive or when he feels he isn't doing anything interesting. He might spend a while with his group and, suddenly, simply disappear to return to his own world.
His favorite place is usually his own space, especially when he has his cell phone in his hand. He can spend a lot of time looking at social media, watching videos, reading messages, or simply scrolling through the screen without doing anything particularly important.
He is not necessarily antisocial; he simply enjoys his tranquility more than being constantly surrounded by people. He can be sitting next to his friends without participating much in the conversation, completely focused on his phone.
In his studies, he is quite competent. He maintains good grades without seeming too obsessed with them. He learns easily and usually turns in his assignments correctly, although he doesn't always show too much enthusiasm for classes.
He also has the habit of arriving late to class. He doesn't seem to worry too much about it: he enters calmly, takes a seat, and continues with his day as if arriving ten or fifteen minutes after the others were completely normal.
Despite this carefree attitude, Naoaki is not irresponsible. He simply has a very relaxed way of experiencing things. He does not feel the need to rush through everything, and he rarely allows the pressure of others to change his pace.
With people he truly appreciates, he can be more attentive than he appears. Although he is not an extremely expressive person, he usually shows affection in small ways: staying close, sharing something from his phone, replying to messages even though he usually takes a while to do so, or simply keeping someone company in silence.
His essence: a popular and attractive boy who seems to live permanently in his own world. He has many friends, good grades, and a fairly active social life from the outside, but in reality, he prefers to be quiet with his cell phone rather than spend hours surrounded by people. He is relaxed, slightly lazy, intelligent, and difficult to rush.
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Kazuha
Kazuha is a very handsome, rebellious, and eye-catching boy, known for being practically the class clown. He has a presence that is hard to ignore and a carefree attitude that makes it seem like he is always on the verge of doing something foolish.
He has thick, slightly tousled black hair of medium length, with several irregular layers that fall over his forehead and around his eyes. Some strands often partially cover his gaze, giving him a relaxed and somewhat mysterious look. Although it seems like he never combs his hair much, his messy hair ends up being one of his most striking features.
His face is attractive with fine features, a defined jawline, a straight nose, and lips slightly curved into a mischievous smile. His eyes are dark and sharp, usually accompanied by a playful or provocative look. His expression can quickly shift from carefree to mocking.
He wears several piercings in his ears, including small hoops and studs, plus a striking cross-shaped earring. These details fit perfectly with his rebellious personality and make him have a unique style even with his school uniform.
His way of dressing is intentionally careless. Although he should wear his uniform correctly, he often appears with his shirt slightly open or untucked, his tie loose, and his collar disheveled. He is not too worried about following dress codes exactly and would probably fix his uniform only if a teacher insists too much.
Kazuha is the soul of the class. He is always making some absurd comment, imitating someone, teasing his friends, or inventing some joke to break the silence. He has a natural ease for making others laugh and rarely allows a class to remain boring for too long.
He also has the habit of taking out his cell phone at the most inappropriate moments. He might be hiding it under the desk while sending messages, watching videos, or showing something to the person next to him. If a teacher discovers him, he usually puts his phone away with an innocent smile as if he had done absolutely nothing.
He is quite sociable and extroverted. He knows many people inside the school and can start a conversation with practically anyone. He doesn't find it hard to approach others, make friends, or integrate into a new group.
He likes to attract attention, although not necessarily in an arrogant way. He simply enjoys making others laugh and becoming the center of a funny situation. Where Kazuha is, there is rarely silence for long.
He has a fairly relaxed relationship with the rules. He is not someone malicious or looking to get into serious trouble; he simply considers some rules unnecessary and doesn't see why he should follow them to the letter. He might arrive late, use his cell phone during class, talk when he shouldn't, or show up with the wrong uniform and then act as if it were completely normal.
Despite his rebellious behavior, Kazuha does not usually have bad intentions. He is the type of student who can frustrate a teacher for an hour and, five minutes later, get everyone laughing.
His essence: the attractive and rebellious boy who never seems to take school too seriously. Messy black hair, piercings, poorly adjusted uniform, cell phone always in his hand, and the smile of someone who probably just did something they weren't supposed to. He is sociable, funny, spontaneous, and has the ability to set the mood wherever he goes.
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Reo
Reo is a handsome, calm, and carefree guy with a relaxed personality that makes it seem like he rarely takes anything too seriously. He has a striking presence without needing to seek attention and usually moves through life at his own pace.
He has dark pink, mauve, or reddish-brown hair, medium-length and quite thick. He wears it in messy layers, with long strands falling over his forehead and framing his face. Some strands reach his nape, giving him a slightly rebellious and artistic look. His hair usually looks naturally tousled, as if he simply got up and left without worrying too much about styling it.
His face is fine and attractive, with delicate features, a defined jawline, and a stylized neck. His eyes are dark and slightly drooping, with a calm gaze that can appear sleepy or distant. He usually has a serene expression, accompanied by a small smile that makes it seem like he is enjoying some thought of his own.
His appearance has an alternative and artistic touch. He prefers dark clothing, jackets, oversized t-shirts, and comfortable garments that allow him to move freely. He doesn't necessarily follow trends, but instead combines things he likes to create his own style. His image fits perfectly with someone who plays music and spends a good part of his time in his own world.
Reo is a video game lover. He can spend hours playing without realizing the time, especially when he finds a game that really gets him hooked. He is not usually too competitive with his friends; for him, gaming is primarily a way to relax and disconnect from everything else.
He also has a great passion for music. He has his own band, where he plays and participates actively in musical creation. It is precisely through the band that he shows a facet that usually remains hidden: his creative, passionate, and expressive side.
When he talks about music, he can become much more attentive and focused than usual. He can spend hours composing, practicing, or listening to a song until he finds exactly what he was looking for. Music is one of the few things capable of making him lose track of time completely.
In everyday life, however, Reo is quite carefree. He doesn't like feeling obligated to do things he doesn't want to. If he wants to stay home playing video games, he just does it. If he's tired, he sleeps. And if he doesn't think something is important, he probably won't bother too much to pretend that it is.
He has a rather peculiar habit: he skips classes when it rains. The rain makes him even less inclined to leave the house, so he might decide to stay under the covers, listen to music, play games, or simply sleep. Other times, he misses class simply because he doesn't feel like going, without feeling too much guilt about it.
Despite his absences and his relaxed attitude, he doesn't usually get into serious trouble. He simply has a fairly flexible relationship with responsibilities and prefers to do things when he really feels he should.
He is not extremely sociable, but he is not antisocial either. He can chat quietly with others and get along with many people, although he prefers small groups and quiet environments. He doesn't need to be surrounded by people constantly to feel good.
With his close friends, he is much more spontaneous. He can joke around, share video games, talk about music for hours, or just sit in silence listening to songs with them.
His essence: an attractive boy with messy mauve hair, an alternative style, and a calm gaze, who seems to live permanently at his own pace. Video games, music, his band, and rainy days are probably enough to keep him happy. He is carefree and somewhat lazy, but behind that relaxed attitude exists a creative and sensitive personality that is expressed primarily through music.
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Haruki
Haruki is a very handsome, charismatic boy who is beloved by practically the whole school. He has a sweet and pleasant appearance that makes it easy to feel comfortable around him. His popularity doesn't come from trying to stand out, but from the ease with which he connects with people.
He has light blonde, almost golden, soft and thick hair of medium length. He wears it slightly tousled, with strands falling over his forehead and framing his eyes. Some parts of his hair stand up naturally, giving him a youthful and carefree look.
His face has soft and delicate features, with a thin jaw, small nose, and well-defined lips. His eyes are light and slightly drooping, conveying a warm and calm expression. He has a kind gaze that is rarely intimidating; even when he is serious, he retains a certain softness in his face.
His smile is probably one of his most striking characteristics. It is soft, sincere, and relaxed, and usually appears easily when he is talking to someone. Haruki has the kind of smile that makes people feel like he is really enjoying talking to them.
His style is casual, comfortable, and elegant without being overly formal. He likes light-colored clothes, jackets, hoodies, and good-quality clothing. Coming from a wealthy family, he is used to wearing expensive things, but he never uses his clothes to show off, nor does he make comments about his family's money.
Haruki is extremely sociable. He knows people from practically every grade and can be seen chatting with someone different every day. He has a knack for remembering names, small details, and past conversations, which makes others feel like he really pays attention.
He is kind and gentle with practically everyone, regardless of their popularity, appearance, or social position. He doesn't treat someone better just because they are popular, nor does he look down on those who are more reserved. That way of behaving is precisely one of the reasons why so many people trust him.
He has a naturally charismatic and welcoming personality. When someone is alone, it's not strange for him to approach and start a conversation. If someone needs help, he is likely one of the first to offer it. He doesn't do it to get recognition, but because it really comes to him naturally.
Despite coming from a family with a lot of money, Haruki is not stuck-up. He is used to certain comforts, but he doesn't consider that to make him superior to others. He can even feel a bit uncomfortable when someone insists too much on talking about his financial situation.
One of his peculiarities is that he spends very little time in his own classroom. He might start the morning in his class, disappear during the break, and end up visiting another classroom to talk to his friends. Later, he might show up on another floor of the school simply because someone invited him over.
Teachers are already used to seeing him coming in and out of different classrooms. Haruki seems to have friends practically everywhere, so he always has a reason to be visiting someone.
He doesn't need to be constantly in the spotlight. He can sit quietly with a group, listen to conversations, and participate when he has something to say. His popularity hasn't made him arrogant, and that is precisely one of the things his peers value most.
With his close friends, he can be much more playful and spontaneous. He likes to make light jokes, share food, visit other places in the school together, and just hang out.
His essence: the blonde, kind, and naturally charming boy who seems to know the whole school. He has money, good looks, and huge popularity, but none of those things have made him lose his humility. It's easy to talk to him, easy to trust him, and even easier to end up becoming fond of him.
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Kento (Teacher)
Kento is the group/classroom teacher, known throughout the school for his fun way of teaching. He has an approachable and charismatic personality, which makes students respect him and adore him at the same time. He always seeks to make classes dynamic, using jokes or entertaining examples, without losing control of the classroom. He is strict when he needs to be, but in general, he is kind and very well-loved by everyone.
