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Trailers & screenshots

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About Mizen Tantei: The Protea Cases

Mizen Tantei: The Protea Cases is a romantic mystery game set in Shinjuku in 2023. You play as Chiharu Itsuki, an assistant at a detective agency who struggles with self-confidence after being kidnapped in the past. While searching for a missing person on a case, she comes across Protea, a crime-prediction AI developed by the Tokyo Metropolitan Police and being tested in Shinjuku.

Investigate the cases

Protea guides Chiharu toward different incidents around Shinjuku, including street attacks, thefts and murders. You gather information and reason through the AI's predictions to prevent crimes before they happen, using intuitive, simple controls to advance the story. Chiharu confronts serious cases alongside the head of the detective agency and police officers.

Meet your allies

A detective asks Chiharu for help, while a mysterious boy keeps appearing at crime scenes. As she works with them and the police, Chiharu gradually forms closer bonds with those around her.

Choose the outcome

Your choices lead the story to several different endings.

Frequently asked questions

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