Shamoto runs a small tropical fish shop. His second wife, Taeko, does not get along with his daughter, Mitsuko, and this worries him. He also feels somehow unfilfilled adn dissatisfied with what his life has become. One day Mitsuko is caught shoplifting at a grocery store. There they meet a friendly man named Murata, who helps to settle things between Mitsuko and the store manager. Since Murata also runs a tropical fish shop, Shamoto establishes a bond with him and they become friends; Mitsuko even begins working for Murata and living at this house, to avoid conflicts with her stepmother.