It has been several months since her only son moved to Tokyo. Worried about her son, who keeps whining on the phone, Mei comes to check on him. While taking care of him in his dilapidated room, her love for him grows and they end up having sex. There is no way that such a relationship can be tolerated. But she still loves her son, who shows her pure affection. A woman's heart is torn between the guilt she feels towards her husband and the love she has for her son. To find the answer to her feelings, Mei goes to see her son once more...