Kyoko took advantage of her husband's absence to deeply entangle herself with her only son. That impulsive night stirred intense emotions within her. When her husband returned home, Kyoko stayed by his side constantly to conceal her affair with her son. Yet, holding onto memories of that night brought her unbearable heartache. Thinking of her son's future, she felt she had no other choice. Meanwhile, her son, whose desires had awakened during his father's absence, began seeking love from Kyoko. Despite his father being nearby, he reached out to her, desperate to claim her love as his alone. As a result, an unsettling tension began to permeate the household.