When the class representative, Haneda Kotoya, is unexpectedly attacked and pinned down, he is bewildered by the culprit's odd smile and declaration of finding true love. This mysterious girl, Kirima Rumika, continues to relentlessly trample Kotoya, claiming it is all for his sake. In a bizarre turn of events, Rumika takes drastic measures like imprisoning Mizukoshi, the fellow class representative, to ensure Kotoya's responsibilities are not neglected. As Kotoya grapples with Rumika's puzzling actions, the true intentions behind her peculiar behavior remain shrouded in mystery.