The live-in job Haruto Kitagami's friend introduced him to turned out to be management of a prestigious girls' dormitory. He quickly grows close to three residents: Rin Natsumi, a cynical girl with a prickly attitude; Hiyori Akishima, cat-like and fond of toying with Haruto; and Aiko Fuyusaki, a young woman with a passionate gaze. Living in their enclosed world, the story of these three takes an unexpected turn.