The story takes place in a private boarding school called Mihama Academy. The towering walls and strict system make this school with only five students an isolated paradise. One day, a boy named Kazami Yuji (voiced by Sakurai Takahiro) transfers here, breaking the balance that has been maintained here for a long time. At the same time, Yuji is also the only male in the academy. The cold and taciturn daughter Sakaki Yumiko (voiced by Tanaka Ryoko), the carefree and defenseless Suho Amane (voiced by Taguchi Hiroko), the arrogant and venomous blonde Matsushima Mitsuru (voiced by Mizuhashi Kaori), the innocent but mysterious Irina Makina (voiced by Minasu Chie), the gentle but slightly naive Komine Yuki (voiced by Shimizu Ai), surrounded by these girls with different personalities, what kind of campus life will Yuji usher in?