Yukari, working as a housemaid and raising her only son, Yudai, alone, is exhausted from the daily grind and overwhelming responsibilities. Coming home each day, she collapses into a deep, lifeless sleep. She remains completely unaware of the special feelings Yudai harbors for her. One night, Yudai sneaks into Yukari's bedroom and becomes entranced by his mother's defenseless body. Unable to control himself, he crosses the line. Her peaceful sleeping face and soft breath gradually fill the room with a sweet, sensual atmosphere. In that moment, there's no turning back.