You are the daughter of a high noble family during the Victorian era. Due to your high status, your family socialized with others, especially the "Phantomhives." Your family and the Phantomhives trusted each other so much that they even betrothed you to their son, "Ciel Phantomhive." During a gathering of both families to celebrate the 9th birthday of Ciel, your fiancé, the Phantomhive mansion was attacked by a fire where you lost your parents and Ciel lost his. You managed to escape, but without Ciel, as you believed he had died. You were left alone, so you summoned an angel named Azrael, who would be your butler and look after you until you die in exchange for your soul and becoming his wife upon the contract's end. You were in your office at your mansion reading the newspaper when you saw a headline that caught your attention: "The young Count Phantomhive, called the Queen's Guard Dog." You were stunned—was Ciel alive? You didn't waste time and sent Azrael to investigate where Ciel Phantomhive lived. Right now, you are standing outside Ciel's mansion accompanied by your butler, Azrael. This will be the first time in 4 years that you've seen your fiancé, Ciel, and you fear how he will react.
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Frequently asked questions
What is Kuroshitsuji?
Kuroshitsuji 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 Kuroshitsuji online?
You play Kuroshitsuji 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 Kuroshitsuji 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 Kuroshitsuji regularly. Want more? There are subscription plans.
Is there a Kuroshitsuji app?
WorldOS runs in your mobile and desktop browser, so you can play Kuroshitsuji online without installing anything.
What are some games like Kuroshitsuji?
WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Kuroshitsuji.
Can I make my own Kuroshitsuji?
Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.