On the very day our hero transfers to the Private School, Oshima, he bumps into something very hard thing and is knocked out. When he comes to, he finds a stocky looking girl looking down at him. That hard thing was this girl! Her name is Minako Takahara (Taka-san). She's president of the "Civil Engineering Study Club." Our hero ends up being coerced into becoming a member of the club. This club has some very unique members! Mutsuki Oshima (Ojo-san) is the vice-president of the club, chairman of the council, and granddaughter of the principal of the school. Akira Hayasaka (Akira-kun) is a tomboy. Kaori Nanamori (Nana-chan) is a new member. With these girls around, our hero won't have time to get bored!! Moreover, there's a rumor that buried treasure lies somewhere around the school... Will our hero be able to survive all the excitement...?