Ryoka lives with her son in the house where her husband is on a business trip. Her son is busy preparing for exams and doesn't pay much attention to her, so she feels lonely. Just then, her son's friend comes over to study overnight and catches Ryoka comforting herself alone! Pressured by her son's friend, Ryoka eventually gives in. Despite feeling guilty towards her husband and son, she cannot resist the young, greedy desires…
