Mugen Shinshi (Japanese: 夢幻紳士, Hepburn: Mugen Shinshi, "Dream Gentleman") is a Japanese manga metaseries by Yosuke Takahashi. The story follows the adventures of Mamiya Mugen, a teenage detective from the Showa era Japan, retold in multiple alternate continuities. The second and main series was loosely adapted into an OVA in 1985, while a crowdfunding campaign for a live action film opened in 2015.