Ayaka has been living with her son Shinsuke almost entirely on her own, as her husband is always away on business trips. Because of this, Shinsuke tends to be clingy towards Ayaka, which worries her about his future... One day, she catches him masturbating. As a mother, Ayaka decides to teach him about sex, but Shinsuke, now seeing his mother as a woman, can't hold back and pushes her down. He regrets doing something irreparable, but from that day on, Shinsuke keeps trying to embrace Ayaka...
