The story takes place at a private high school called Sakusai Academy. Originally a girls' school, Sakusai Academy is forced to open to the public as a comprehensive school due to social pressure on the ratio of men to women. This year, the school welcomed the first batch of male students. Although the ratio of 28:524 makes the new boys feel particularly nervous, as a comprehensive school, Sakusai High School has a new future. As one of the twenty-eighth, Tsuda Takashi (voiced by Asanuma Shintaro) obtained admission qualifications with his seemingly ordinary grades in all aspects. On campus, Takashi met the president of the student union, Amakusa Shino (voiced by Hikasa Yoko), and began his student union career. Secretary Nanajo Tenku (voiced by Sato Satomi), accountant Hagimura Suzu (voiced by Yahagi Sayuri), consultant Yokoshima Naruko (voiced by Kobayashi Yu) and other women have appeared beside Takashi one after another, and these girls with cute and beautiful appearances all have personalities that cannot be summarized as normal in any way. What is going on?