Upon settling into Kawai Complex, Kazunari discovers that he has to share a room with resident masochist Shirosaki. He is also living with other quirky characters like Mayumi Nishikino, a hopeless romantic alcoholic, and Sayaka Watanabe, an apparently demure college student. Despite these oddities, Kazunari considers himself fortunate to be in the same building as Ritsu Kawai, a second-year student whom he has a crush on.
As Kazunari adjusts to his new home, he soon realizes that the Kawai Complex's inhabitants are bound to throw a wrench into the peaceful life he had envisioned.