Alto, a dreamy cloud gazer with a heart of gold, nearly drowned while saving a cat. On the brink of death, he is saved by a girl with cloud-like hair. But instead of praise, she received a bitter beating from her mother. It shook him to the core until he abandoned his belief in helping each other and closed himself off from others. Years later, under the noctilucent cloud, he met his savior. He tried to run away, but his old kindness overcame him to befriend her, to repay her kindness while keeping their past a secret.