After leaving his wife and children behind to work in the city, Kobayashi spends his lonely days gambling to relieve stress. Eventually, he falls behind on rent. That's when his landlady's wife, Chisato, shows up. Always kind to him, she offers to forgive the debt if they have sex. Unable to satisfy her husband, Chisato uses Kobayashi to fulfill her desires, leading them both into a messy affair.
