Hatsuko loves reckless bike riding with her gang much to the anger of her mother, a serious and traditional widowed woman who’s earning the small family’s living by working as a kouta master. After a serious accident Hatsuko lands in hospital, where she’s treated by a surgeon. What she doesn’t know is, that the doctor was her mother’s first love and she is in fact his daughter. When Hatsuko realizes that her mother’s interest in the doctor is much more than gratitude her close relationship with her mother begins to detoriate.