Kyuu is your average boy with a knack for logic and reasoning. Desiring to become a detective, he finds out about the existence of the Dan Detective School (DDS); a famed school where students are allowed to bear arms. Together with Megu, a girl with photographic memory, the martial arts master Kinta, the genius programmer Kazuma and the mysterious Ryuu, Kyuu tackles many well planned out crimes, always seeking the truth.

Megumi Ogataas Kyuu Renjo
Houko Kuwashimaas Megumi Minami
Kouichi Toochikaas Ryuu Amakusa
Tomoko Kawakamias Kazuma Narusawa
Hideo Ishikawaas Kintarou Tooyama
Shinichirou Mikias Koutarou Nanami
Satsuki Yukinoas Sakurako Yukihira
Hideyuki Tanakaas Morihiko Dan
Aya Hisakawaas Shino Katagiri
Ken Naritaas Shintarou Maki