Kouya Yamamiya is a second year high school prodigy who excels in almost anything he does. He moves back to his hometown with his family and enrolls in Yukinohara High School. There, he reunites with his childhood friend Shizuru Takiguchi, and also befriends clumsy junior Tsubasa Kakedori and strict senior Kuzuha Takamiya.

Kouya soon becomes the target of all the clubs, who desire to use his expertise as a "specialist" to advance their own agendas for the school festival in one month. Divided over whom he should help, he decides to help as many clubs as he can in time for the festival, which attracts the eyes of 14 other girls in various culture and sports clubs. Pressed for time, Kouya gets to work...