The otherwise tranquil atmosphere at Ourin Gakuen abruptly shifts one day. After a coup, Kusunoki-sensei, the so-called subheroine, and the majority of the students take control the school. The principle has been defeated, and it is now up to Yuu Sakurano, Yuzuki Kaede, and Nagomi Fujikura to reclaim the school and restore it to its previous calm state. This is the start of a full-fledged conflict, the likes of which this institution has never seen before.