Trickster

A young woman approaches the Boy Detectives' Club and asks them to find the intended recipient of a series of threat letters her boyfriend made.

Kobayashi somehow feels that maybe he can die if he stays with Hanasaki, so he joins the Boy Detectives' Club.

After school, Inoue watches Katsuta's tennis club practise before heading home, and Hanasaki tests out some tools of the Boy Detectives' Club trade.

Kobayashi and Inoue are trapped in the underground channels as a result of Twenty Faces' manoeuvring.