The story takes place at a certain middle school where several murder cases take place. Kobayashi, a boy who goes to this school, meets genius detective Akechi, who comes to the school to investigate. Kobayashi takes an interest in Akechi and, in spite of his friend Hashiba's worries, he volunteers to be Akechi's assistant.

• Rie Takahashi
• Katsuyuki Konishi
• Kappei Yamaguchi
• Takahiro Sakurai
• Cho
• Daiki Yamashita
• Jun Fukuyama
• Yoko Hikasa