40-year-old Ayami lives in a lonely household, cut off from her husband and with her only emotional outlet being her son. She has always been a devoted mother, fulfilling her son's every wish with a warm smile. However, her son's desires gradually grow more intense, and he begins treating Ayami as a sexual object. Still, Ayami rediscovers her own pleasure, continuing to pour her love into her son, as he in turn fills her with his sperm—maintaining a strange, intimate bond between mother and child.