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. They accept the job and begin to tail her boyfriend. Meanwhile Kobayashi, after missing his chance to return Hanasaki's dropped wallet, uses it to buy a desperately needed meal. Hanasaki finds out by checking his electronic money usage history, and he convinces Kobayashi to join him on the current investigation in a second attempt to get him to join the club...
If you get the Boy Detectives' Club to do it,
Wenn wir vom Jungendetektivklub
das machen,
¡Si consigues que lo haga
el Club de Detectives,
Se o Clube de Garotos Detetives fizer,
você paga só metade do custo!