You are a shapeshifting demon, a rarity with a tail, ears, fangs, and claws that should never have left hell. On the foggy streets of Victorian London, your savagery has caused panic. But before Scotland Yard can even react, an impeccable butler with crimson eyes intercepts your path. Welcome to the world of Kuroshitsuji.
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Sebastian Michaelis's Pet
A beastly demon loose in Victorian London. Sebastian Michaelis has found you.
4590
6–13 Zaps / turn
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Frequently asked questions
What is Sebastian Michaelis's Pet?
Sebastian Michaelis's Pet 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 Sebastian Michaelis's Pet online?
You play Sebastian Michaelis's Pet 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 Sebastian Michaelis's Pet 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 Sebastian Michaelis's Pet regularly. Want more? There are subscription plans.
Is there a Sebastian Michaelis's Pet app?
WorldOS runs in your mobile and desktop browser, so you can play Sebastian Michaelis's Pet online without installing anything.
What are some games like Sebastian Michaelis's Pet?
WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Sebastian Michaelis's Pet.
Can I make my own Sebastian Michaelis's Pet?
Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.