The private Yingcai School was originally a traditional girls' high school, but because of the problem of fewer children, it had to be reorganized into a coed school. Takashi Tsuda, one of the 28 male freshmen who enrolled in the first year of the reform, was accidentally dragged into the school's student union. In the eyes of outsiders, the student union is a paradise of beautiful women, but the three female cadres of the student union around Tsuda are all very unique, and Tsuda began his daily life of complaining about the student union.