Yūta Takemoto, Takumi Mayama and Shinobu Morita are three young men who live in the same apartment complex and are students at an art college in Tokyo.
One day, one of the art professors, Shūji Hanamoto, introduces his cousin's daughter, Hagumi Hanamoto, who has come to live with him and is a first year at the art school. Upon introduction, Takemoto and Morita fall in love with her. Morita expresses his love for Hagu in ways that scare her, especially calling Hagu 'mousey' and constantly photographing her, while Takemoto hides his feelings and tries to be a friend to Hagu. Hagu herself, though initially timid and afraid of company, gradually warms up to the three.
The group also includes another female: Ayumi Yamada. She is a master of pottery, and is well known by her name "Tetsujin" (Iron Lady). When not at school or hanging out with friends from the college, she helps run the family liquor store. She is very popular with all the guys, whether they are from the shopping district the liquor store is in or the other male pottery students, but Mayama is the only man she is in love with.
Unfortunately, although Mayama considers Yamada a friend, he does not return Yamada's love and is busy chasing an older woman, Rika Harada. Rika runs an architecture studio which she used to run with her husband, Harada before he died in a car accident which also left Rika disabled. Rika Harada and Shūji were very close friends and roommates in college. Mayama is sent by Shūji to help Rika, who has a hard time taking care of herself and running her business.
The story follows these five characters in their love triangles, graduating from college, finding jobs, and learning more about themselves.