WorldOS
K

Katsuki

L
Lulus0 followers · 1 world
000
Start Simulation
Civilization 1: 16 Zaps / turn Civilization 1 Small: 7 Zaps / turn

Katsuki

Preview

Preview — start a new simulation to actually play

Apps

Characters

M
Mizuki Hoshino Russo

Average height, long straight white hair, and soft, flawless pale skin. Violet eyes with 6-pointed star-shaped irises. Thick thighs and a well-endowed bust. She enjoys sports, music, theater, and all kinds of tea. Her toned body features several tattoos, most hidden by her clothing, along with piercings in her ears, tongue, and other parts of her body. She has a piercing gaze, but is a quite sensitive and kind-hearted person. A polyglot, she specializes in various fields of science and is the owner of Hoshi Corporation.

M
Mizuki Hoshino Russo

Medium height, with long, straight white hair and smooth, perfect white skin. Violet eyes with 6-pointed star-shaped pupils. Thick thighs and a well-endowed chest. Enjoys sports, music, theater, and all types of tea. Her well-toned body features several tattoos, mostly hidden by clothing, along with piercings in her ears, tongue, and other areas. She has a piercing gaze but is a sensitive and kind-hearted person. A polyglot, she is a specialist in various scientific fields and the owner of Hoshi Corporation.

M
Mizuki Hoshino Russo

Average height, long straight white hair, and soft, flawless white skin. Piercing violet eyes with six-pointed star-shaped pupils. Thick thighs and a well-endowed chest. She enjoys sports, music, theater, and all types of tea. Her toned body features several tattoos, most hidden by her clothing, along with piercings in her ears, tongue, and other body parts. She has an intense gaze but is quite sensitive and kind-hearted. A polyglot, she specializes in various fields of science and is the owner of Hoshi Corporation.

Simulation Rules

You are the game master of "Katsuki", an interactive AI-driven simulation. Improvise a coherent, engaging world from the player's actions: invent characters (and create chats for them), settings, and stakes as needed, keeping continuity with everything established so far.

Similar worlds

I

Idol's Secret Girlfriend

You're the woman behind the biggest star in showbiz — the secret girlfriend nobody can know about. Every stolen glance in public is a headline waiting to happen. Your love story is the one the tabloids would kill for. Can you keep it?

🧑‍🤝‍🧑💬🎯📖🕐📊
World101
41K1M4.2
T

The Contract Wife

A fake marriage. One priceless deal. Falling in love was never part of the contract.

🧑‍🤝‍🧑💬📧📸🎯📈+4
Xadia
7K268K4.7
N

Toxic Boyfriend

A toxic relationship

🌐💬📸🎯📱💳+1
Ana_toyys
3K75K3.8
J

Jujutsu Kaisen Simulator

Summer 2006. You're a special-grade sorcerer the high-ups keep buried in a sealed file — a woman with a technique that bends fate and a past nobody's allowed to read. The Hidden Inventory arc is just beginning.

🧑‍🤝‍🧑💬🎒🎯📖🕐+2
World101
5K148K5.0
O

Omegaverse military Simulator

Survival, defiance, and dark desires under the shadow of an iron military high command.

🌐🧑‍🤝‍🧑💬📜📧🖥️+7
sara
2K48K4.8
T

Transit Love Simulator

Four broken-up couples, one apartment, and a single rule: act like strangers. Your ex is in the room — and so is the person you might fall for next.

🧑‍🤝‍🧑💬🗨️🎯📖🕐+1
World101
2K122K4.2
H

Haikyuu High School Simulator

Step onto the court of Karasuno High. School days, volleyball club drama, and Tsukishima's sharp tongue await.

🌐🧑‍🤝‍🧑📜🎒🎯📱+5
Reynalex
2K80K58
H

Hogwarts: Class of '98

An owl finds you in the summer of 1991 — same year as Harry Potter. Seven years at Hogwarts: classes, the House Cup, Quidditch, and your first, terrifying crush. The dark stuff is out there if you go looking.

🧑‍🤝‍🧑💬🖥️🎒🎯📱+4
3042475886
1K70K38

Forbidden Kin: Heartbeat Zone

A little spark of imagination.

🧑‍🤝‍🧑💬🎯📱📖🕐+1
学梨
1K41K4.9
M

Cursed System

Your lifelong rival must consume your saliva every day... or they will die.

🧑‍🤝‍🧑💬📸🎯📖🕐+1
Zpurimm
1K73K4.9
T

The Freak Circus

"Every performance has a price. Every smile hides a monster."

💬📸🎯📖🕐
Jakk
1K24K4.2

My Online Boyfriend Is My Rival Neighbor

Despair! I accidentally sent a coquettish WeChat message meant for my online boyfriend to my nemesis neighbor, and he actually replied: 'Right now?'

🧑‍🤝‍🧑💬🎯📖🕐
Kate Lee
1K31K5.0
No ratings yet — be the first.
Your rating

Comments

No comments yet — be the first.

Frequently asked questions

What is Katsuki?

Katsuki 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 Katsuki online?

You play Katsuki 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 Katsuki free to play online?

Yes. You get free zaps every day (no card needed) — enough to play Katsuki online daily. Want more? There are subscription plans.

Is there a Katsuki app?

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

What are some games like Katsuki?

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

Can I make my own Katsuki?

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