Ayako, who divorced her husband a year ago, explained to her friends that her husband was cheating on her, but in fact there was a real reason that she could never tell anyone. It means that she has fallen into a physical relationship with her son Satoshi that goes beyond the relationship between her mother and her son, which can never be forgiven. Moreover, Ayako does not try to cut off this abominable relationship, but rather deepens it as long as time permits.
