Shiratori Ryushi wants to become a picture book writer, and he moves to an apartment, Narutaki-Sou, in order to go to an art school in Tokyo. Narutaki-Sou is an old Japanese style one-story house which doesn’t fit in urban scenery. The complex is owned by his mother’s cousin and the manager of the apartment is his second cousin, Aoba Kozue. They met each other when they were children, although Shiratori doesn’t remember much of it. Kozue is in the second grade of a high school attached to Aoba Junior College.

There are seven residents of Narutaki-Sou. The first, Chanohata Tamami, lives in room #1 and she is Kozue’s childhood friend. Shiratori Ryushi, the main character of the series, resides in room #2. In room #3 resides Momono Megumi, a person who goes her own way in life. Kurosaki Sayoko and her daughter Asami, who is in the first grade of middle school, live in room #5. Finally, in room #6, Haibara Yukio lives with his puppet Johnny.

Narutaki-Sou is filled with characteristic and eccentric people. However, the most eccentric person is Kozue herself. She has a secret of which even she does not know; when she is shocked at something, her personality changes. Not knowing this, Ryushi moves to Narutaki-Sou to realize his dream.