The private Sakura Academy was originally a traditional girls' high school, but due to the declining birthrate, it had to be restructured into a coeducational school. As one of the 28 male freshmen who enrolled in the first year after the restructuring, Takashi Tsuda was accidentally pulled into the school's student union. To outsiders, the student union is a paradise full of beautiful women, but the three female student union leaders around Tsuda have very unique personalities, and Tsuda began his daily life of complaining about the student union.