Hitomi Ueno is a 42-year-old mother who has always hoped for her son to achieve academic success. One day, she visits his room to deliver a cup of cocoa and unexpectedly catches him reading a porn magazine and masturbating. Driven by maternal responsibility, she strongly urges him to stop such bad habits, but the sight deeply stirs emotions within her. The relationship between mother and son is pushed into uncharted territory, challenging the boundaries of their bond.