While on a fishing boat, Naoko is captivated by a boy running along the shore. Tragedy hits when Naoko falls off the boat and the captain of the ship, the boy’s father, dies saving her from drowning. Six years later Naoko meets Yusuke, now an elite runner, at a marathon competition and reintroduces herself. Later, when the opportunity to become co-manager of Yusuke’s team presents itself, Naoko takes it. Yusuke resents Naoko's presence, but slowly they embark on a journey of forgiveness and healing their sorrows from the past.