The Private Aichi Symbiosis Academy was originally a high school for high-class girls, when it became co-ed, the girls, out of fear, asked to be permitted to bring weapons to school. When that was enforced, a five-member vigilante corps-like organization called the "Supreme Five Swords" was also formed.
After many generations, the five swords eventually became a group which corrected problematic students and such the academy started proactively accepting such students in order to correct them.
Nomura Fudou was sent to that school after being part of a huge brawl, what will he do when the only options he has after enrolling are being expelled from that school too or being corrected the way the rest of the male students there were… by being forced to dress and act like girls!

Inti ceritanya sih tentang sekolah yang mayoritas diisi siswi, terus ada peraturan dimana siswi boleh memiliki senjata buat self defense. Efeknya cowok yang ada di sekolah itu harus ber"adapatasi" dengan lingkungan di sekolah itu dengan menjadi Okama. Trus si MC tu cowok yang pinter berantem tangan kosong, dan di sekolah yang baru ini dia harus berhadapan dengan 'Supreme Five Swords" jika dia tidak mau ber"adaptasi" di sekolah itu.