Juu Juuzawa, a rebellious loner, rarely values friendships. When Ame Ochibana insists they shared a bond in past lives, he dismisses her outright, refusing any connection. Oddly, she yearns to serve him. Convinced of her delusion, he pushes her away. Yet after a classmate"s death, Juu opts to keep her nearby, suspecting the odd girl of being responsible. Still, her sharp mind and abilities soon become essential as they collaborate to uncover the killer.