Kobayashi, who left his wife and child and was assigned alone in the city, and spent his days relieving stress by gambling to kill loneliness and leisure, finally became delinquent in paying his rent. Then, the landlord's wife, Chisato, came there. - The gentle Chisato, who always cares about Kobayashi, asks for a physical relationship instead of forgiving the delinquent payment. While being used as an outlet for the sexual desire of a frustrated wife who cannot be bothered by her husband, Kobayashi falls into a muddy unfaithful relationship with Chisato.