Overwhelmed by the strain of balancing work and family life, Shinichi finds his relationship with his wife, Hitomi, deteriorating, leading to growing dissatisfaction in their sex life. Seeking relief, he visits a brothel—where by chance, he reunites with Sarina, a fellow mom from his child’s school circle. What begins as an unexpected encounter soon evolves into a secret affair. Initially conflicted and burdened with guilt, Shinichi gradually becomes emotionally entangled with Sarina, torn between domestic responsibilities and rising desire. As his marriage further crumbles, his clandestine meetings with Sarina become increasingly irresistible. Trapped within the confines of family life, Shinichi is forced to confront his true feelings.