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...
I recommended it to the guys I work 
with, but they wouldn't listen.
Ich empfehle es auch meinen Kollegen,
aber keiner hört auf mich.
-¿Qué?
-Se la recomendé a la gente
Indiquei no trabalho,
mas não me deram ouvidos.