Naoomi Ueda learns only after his father's death that he was a hidden child, born to his father's lover, and the shock sends him running away from home. He meets Fujisaki, a girl who has also run away because of trouble with her own family, and she asks him to help her stage a fake kidnapping so that her family will finally worry about her. The time the two runaways spend together slowly turns into love, until the end of their trip brings a shocking truth to light.