Fumiko, a mother whose husband died early, has been raising her son Naoki on her own. Fumiko showers Naoki with love, a gift from her husband, and Naoki begins to feel a sense of devotion, thinking that he must now support his mother. The two, who are in love with each other, realize their feelings for each other and eventually cross the line between mother and son, developing into a relationship filled with twisted love and lust.