Kiichi lives with his mother and sister on a boat floating on the Tosabori River, where he meets Nobuo, a second-grade boy. Set in a riverside town, the story portrays their brief friendship and the harshness of an adult world the children cannot yet fully understand.

Meeting a boy who lives on a boat afloat on the river changes Nobuo's summer into one he cannot forget.

A work of fiction by Yamaguchi Izumi, selected as an outstanding work of the Dazai Osamu Prize.

A work of fiction known as an early work by Yamaguchi Izumi.