My Dear Detective: Mitsuko's Case Files manga volume 2 features story and art by Natsumi Ito.

In Showa-era Tokyo, fraud is rampant and Japan's first woman detective, Mitsuko Hoshino, is on the case! The organized crime syndicate responsible for the wave of corruption has captured her, and while in their clutches, Mitsuko discovers the terrible truth--the boss of the gang is a child! In a city where even kids have to toil, of course some will go bad, but what can Mitsuko do about it?!