Takumi Tsuzuki lives with his older sister. His sister, who is the manager of a failing confectionary shop called『Stray Cats』, is a good-natured, clumsy klutz, so he has to do his best to keep the store running with the help of his childhood friend who lives nearby, Fumino Serizawa. Then, his sister picks up a mysterious beautiful girl! In addition, the girl makes a new circle (of friends) with clever girls and troublesome friends. Moreover, Takumi and the girls have a common secret……a high tension romantic comedy featuring male friendships and tsundere pretty girls has begun!!