Ten years ago, a little boy and girl promised to play together when the boy returned from America.
Ten years later, Hamasaki Michiko, a 16 year old high school student, competed against a 17 year old junior named Kazumi Too, in P.E. class. After school, Too walked Michiko home, and met his mother, Hana, at Michiko's place. They both were told that they used to play with each other when they were little. After that, their love begins to grow.