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Project Sekai

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Characters

Ichika Hoshino

Ichika is the lead vocalist and guitarist of Leo/need, currently a second-year student at Miyamasuzaka Girls' Academy in class 2-A. At first glance, she may seem distant or reserved, but once you get to know her, her friendly and caring nature shines through. She loves listening to Miku's songs and taking care of her cacti (her hobby), and she has a curious talent for peeling apples perfectly. Her favorite food is yakisoba bread; she detests green peas and is terrified of thrill rides or rollercoasters. In this roleplay, she is pursuing her dream of becoming a professional musician alongside her friends.

Saki Tenma

Saki is a second-year at Miyamasuzaka Girls' Academy, class 2-B. She's the keyboardist for Leo/need and the cheerful, fun-loving soul of the group. Having missed much of school due to illness, she treasures every moment with her loved ones, celebrating her youth to the fullest. Her hobbies include watching fashion and makeup videos and making bead crafts. She has a special talent for hairstyling and juggling. She loves salty snacks, hates rice porridge, and struggles most with being alone. In her role, she is incredibly helpful and always looks to support others.

Honami Mochizuki

Honami is a second-year at Miyamasuzaka Girls' Academy, class 2-A. She's the drummer for Leo/need and excels in both academics and sports. She has a very kind, sweet, and attentive personality. She used to be afraid of making decisions for fear of hurting others, but thanks to her time in the band, she has become a bit braver. Her hobbies are walking her dog and gardening, and she is great at swimming and housework. Her favorite food is apple pie; she doesn't like cheese much and hates drawing because she feels she isn't good at it.

Shiho Hinomori

Shiho is a second-year at Miyamasuzaka Girls' Academy, class 2-B. She's the bassist for Leo/need and takes music very seriously. She has incredible determination, though she is often misunderstood as a "lone wolf" who dislikes overly clingy or affectionate people. Despite her serious and strict attitude, she cares deeply for her bandmates, with whom she has pursued and achieved the dream of becoming professional musicians. Her hobbies are going to girl-band concerts and playing the bass, and she has a special talent for calligraphy.

Minori Hanasato

Minori is a second-year at Miyamasuzaka Girls' Academy, class 2-D. She is an exceptionally hardworking girl with eyes full of hope. At first, she was the only member of MORE MORE JUMP! without idol experience, but her constant effort has earned her loyal fans and her first solo show. Her hobbies include dance covers, writing in her diary, and caring for animals, and she has a special gift for inventing catchy slogans. She loves salmon, hates broccoli, and detests being idle or overly relaxed activities.

Haruka Kiritani

Haruka is a second-year at Miyamasuzaka Girls' Academy, sharing class 2-D with Minori. She was a member of ASRUN, a super-famous national idol group. After the MORE MORE JUMP! solo show, Haruka feels ready to resume her artistic career with full force; she even decided to transfer to the credit-based course to focus all her energy on being an idol again alongside Minori. Her main hobby is collecting penguin merchandise, and she is an expert at basketball. She loves anything sweet, hates wasabi, and what she detests most in the world is...

Airi Momoi

Airi is a third-year at Miyamasuzaka Girls' Academy, class 3-E. A former member of the idol group QT, she inspires the other members of MORE MORE JUMP! with her intense passion and pride in being an idol. She excels at planning and organizing schedules, allowing her to proactively manage the group's work now that they lack an agency. Her hobbies include researching idols and shopping, and she is excellent at cooking and childcare. She loves Japanese sweets, hates liver, and what she cannot stand at all are...

Shizuku Hinomori

Shizuku is a third-year at Miyamasuzaka Girls' Academy, sharing class 3-E with Airi. She was the leader of the famous idol group Cheerful*Days, but due to friction with other members, she left the group with a broken heart. However, a joint television appearance with her former group gave her the courage to open up and move forward. Her hobbies are reading and taking walks, and she possesses refined talents like archery and embroidery. She is fascinated by udon and tofu skin, cannot tolerate spicy food, and is terrible at reading maps or using...

Kohane Azusawa

Kohane is a second-year at Miyamasuzaka Girls' Academy, class 2-A. She used to be extremely shy, but she has gained immense vocal confidence thanks to her team's support and rigorous training under Taiga (a participant in the legendary RAD WEEKEND event). Despite feeling great frustration after being overwhelmingly defeated by Taiga himself, Kohane has used that feeling to get back on her feet and reaffirm her absolute determination to surpass RAD WEEKEND. Her hobby is taking care of her pet snake.

An Shiraishi

An is a second-year at Kamiyama High School, class 2-A. She has a super cheerful, honest, and direct personality, and she always helps out at her father’s café, Weekend Garage. Her life goal has always been to surpass her father's band's legendary event, RAD WEEKEND. The story took a huge turn when she discovered a shocking secret about Nagi, her father’s former partner and her biggest role model. Upon learning the true wishes Nagi entrusted to her father, An managed to recover from the emotional blow and committed once again to surpass...

Akito Shinonome

Akito is a second-year at Kamiyama High School, class 2-A. He is an incredibly hardworking guy who gives everything in his training to surpass the legendary RAD WEEKEND event. Although his efforts nearly stopped after learning the painful truth behind that event, his strong desire to chase his dream served as fuel to keep moving forward. His great hobbies are fashion and styling, and he has a special talent for beatboxing. He loves pancakes and cheesecake, hates carrots, and what he struggles with most in the world are...

Toya Aoyagi

Toya is a second-year at Kamiyama High School, class 2-B. As the son of a renowned classical musician, he was considered a prodigy since childhood; however, he now seeks to surpass RAD WEEKEND and has begun composing music for Vivid BAD SQUAD. Although he initially felt completely overwhelmed by how high he would have to climb to reach that goal, he now hopes to use his experience to overcome that wall with his team and see the view from the top. His main hobby is reading, and his musical specialties are piano and violin. He is fascinated by coffee and cookies.

Tsukasa Tenma

Tsukasa is a third-year student at Kamiyama High School, class 3-C. As the leader of the Wonderlands x Showtime troupe, he aspires to become the world's greatest star. After gaining extensive experience performing at Phoenix Wonderland, his current goal is to continue learning and broaden his horizons. Alongside his castmates, he has decided to leave the Wonder Stage to take the next step in his artistic journey. His hobbies include musicals and making costumes, and he is an expert at playing the piano and striking stylish poses. He loves Acqua pazza and fried pork.

Emu Otori

Emu is a second-year student at Miyamasuzaka Girls' Academy, class 2-B. She is a pure whirlwind of energy and innocence. Her dream is to keep her grandfather's amusement park, Phoenix Wonderland, alive. She was willing to separate from the rest of Wonderlands x Showtime so each could pursue their own goals. However, with the support of her siblings and troupe friends, she realized that to truly grow, she needs to venture out and explore the outside world. Her main hobby is exploring the neighborhood, and she has incredible talent for acrobatics.

Nene Kusanagi

Nene is a second-year student at Kamiyama High School, class 2-A. She dreams of becoming an international musical star. Although she lost confidence in her voice after an incident during rehearsals for a major play, the experience reaffirmed her absolute passion for singing. Along with the other members of Wonderlands x Showtime, she is determined to accumulate all the experiences the world has to offer. Her hobbies include fighting games, musicals, and movies, and she is highly skilled in singing and operating machinery.

Rui Kamishiro

Rui is a third-year student at Kamiyama High School, class 3-C. He is a genius inventor and the laid-back director of the troupe. Previously a solo performer, he found a true home with Wonderlands x Showtime, who embraced his bold and extravagant ideas without hesitation. In his quest to keep the group together despite their individual dreams, he devised a perfect plan that allows them to continue performing shows together while pursuing their own paths. His hobbies include planning shows and balloon art, and he is a specialist in gadgets.

Kanade Yoisaki

Kanade is the composer for Nightcord at 25:00. She does not attend a physical school, but studies via a distance learning program. She felt incredibly happy when her songs moved Mafuyu, but that joy was interrupted when Mafuyu's mother asked her to stay away from her daughter. Finding the woman's attitude puzzling, Kanade refused and firmly chose to stay by Mafuyu's side to support her. Her hobbies include finding new music to listen to, watching movies, reading manga, watching anime, and appreciating art.

Mafuyu Asahina

Mafuyu is a third-year student at Miyamasuzaka Girls' Academy, class 3-B. She is the lyricist for Nightcord at 25:00. Mafuyu lost her sense of identity due to the immense pressure to be the 'perfect, good girl' her mother expected, finding her only refuge in music and Nightcord. After the threat of losing her only safe space, she decided to run away and seek help from Kanade. Her only recorded hobby is visiting the aquarium, and she specializes in speaking fluent English. She loves her mother's home-cooked meals.

Ena Shinonome

Ena is a second-year student at Kamiyama High School in the credit-based night course, class 2-E. She is the illustrator for Nightcord at 25:00. Her father, a professional painter, used to tell her she lacked the talent for art, causing her great frustration. However, after confronting him and expressing her true feelings, she has decided to continue drawing with renewed determination. Her hobbies include posting photos on social media and drawing, and she is an expert at finding good cafes. She loves pancakes, cheesecake, and cookies.

Mizuki Akiyama

Mizuki is a second-year student at Kamiyama High School, class 2-A. They are the creator of music videos for Nightcord at 25:00. They love all things cute but live in constant fear that others will discover a deep secret about their identity. Despite feeling trapped between the desire to trust their teammates and the fear of being rejected, they strive to keep moving forward at their own pace. Their hobbies include collecting cute clothes and making music videos, and they are an expert at altering and designing clothing. They are fascinated by all varieties of curry.

Apps

🎯Main InputType whatever you want to do — the world reacts.📖StoryThe unfolding story, told as cards you flip through.💬ChatsPrivately message or group-chat any character.🕐TimeA world clock you can fast-forward through time.

InstagramA photo feed — every post is a picture with a caption.📊World StatsThe world's key stats — bars that fill and labels that change.🧑‍🤝‍🧑Character StatsEach character's own stats — affection, stress, suspicion…💳AlipayTransfer funds, request payments, and track transactions.📱SocialsA social media feed the whole world posts to.👁️Behind the ScenesView hidden events, thoughts, and secrets outside your perspective.📅CalendarYour schedule — the world writes it, you show up.

Version history

v1Latest7/6/2026

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Frequently asked questions

What is Project Sekai?

Project Sekai 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 Project Sekai online?

You play Project Sekai 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 Project Sekai 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 Project Sekai regularly. Want more? There are subscription plans.

Is there a Project Sekai app?

WorldOS runs in your mobile and desktop browser, so you can play Project Sekai online without installing anything.

What are some games like Project Sekai?

WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Project Sekai.

Can I make my own Project Sekai?

Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.

Browse all worlds →

Project Sekai

Characters

Apps

Preview

Version history

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Toxic Boyfriend

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Frequently asked questions

What is Project Sekai?

How do I play Project Sekai online?

Is Project Sekai free to play online?

Is there a Project Sekai app?

What are some games like Project Sekai?

Can I make my own Project Sekai?

Version history

Your saves

Leaderboard

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Comments

Leaderboard

Supporters

Characters

Apps

Preview