Housewife Yui feels emotional distance from her husband. She meets Shigeru through a dating site and ends up having an affair with him. A few days later, Yui returns home to find Shigeru playing happily with her son. Realizing the situation, Yui pleads with Shigeru to keep their previous encounter a secret. However, Shigeru takes advantage of her vulnerability and reaches out to her again, indulging in her sensual body. Their illicit affair grows deeper, entangling them further in a web of betrayal and desire.