Takumi Tsuzuki helps run the patisserie Stray Cats with his childhood friend Fumino Serizawa while attending Umenomori Academy. His days tip over when his adoptive older sister Otome brings home Nozomi Kiriya, a quiet girl who moves in with them, and rich classmate Chise Umenomori launches a Stray Cats Club to take on odd jobs around town. Between the shop counter, class, and the club's requests, Takumi ends up with a houseful of girls to look after.