Ayumi Sato

This anthology-style mystery series is part of the D‑5 PROJECT, centered around Detective Office 5 - a long-running private detective agency in Kawasaki. Each detective is known only by a number rather than a name (e.g., Detective 596, 532), with standalone stories featuring different characters and surreal, quirky cases.

Mamiya Mugen is a detective who has the ability to look into people's minds and show their dreams to others. He is lured by the disembodied voice of girl, Nayuko Mishima, who has been missing for months.