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 live action film The Dream Manipulator Mugen was released in 2021.
[1][2] The first manga series introduces Mamiya Mugen, the child heir of a rich family that enjoys solving crimes for the Japanese police during the Showa era.
A much more serious, almost horror-oriented view of the series is given in its third continuity, Kaiki-hen, where Mugen is now a suave, distinguished ladies man in his twenties.
He works mostly alone and meets a long string of lovers in his cases, but is helped by his spiritual powers and his mentor Professor Yokomizo.