A year has passed since their marriage, and Tetsuo spends his days chasing after his wife. One day, the couple visits her parents' home, where he meets Michiko, his wife's mother—a woman different from his spouse, gentle and considerate. With her husband having passed away three years ago, she appears to live a lonely life, and Tetsuo begins to feel emotions he can't suppress. Eventually, overwhelmed by her warmth and affection, he loses control and makes a move on his stepmother.