Ryo Hayakawa

In order to uphold his title of High School Detective, a teen sleuth must protect his classmates from kidnapping after receiving a threatening letter.

Kaoruko, the daughter of a doctor and attending a prestigious high school in Fukuoka, was vaguely anxious about the future. She's even more scared when her friend Natsumi invites her to membership-based prostitution club.

Mizuki disguises herself as a boy and transfers to the same all-boys' high school her idol, Izumi Sano, a high-jump athlete who gave up on the sport, attends. In between their classmates' antics she tries to get him to jump again.