Synopsis: Detective Akechi in a frenzy.

The manga's story is an homage to Edogawa Rampo's The Boy Detectives Club novel series. The mystery centers around Mayumi Hanazaki, a middle-school girl who used to live with her aunt and uncle until a mysterious person mercilessly killed both. Now, thanks to an unusual incident, Mayumi relies upon the spirit of the legendary detective Kogoro Akechi to solve cases.