After losing her husband, Kyoko devoted herself to raising her son Makoto alone. Until now, Makoto had his mother all to himself, but one day, Kyoko suddenly introduces her new husband. Under the influence of this new father figure, Kyoko's sensual charm begins to grow day by day, arousing forbidden desires in Makoto. Frustrated by losing exclusive access to his mother, Makoto becomes consumed by lust and starts pursuing Kyoko's body in a desperate attempt to reclaim her. The mother-son bond begins to shift into something dark and taboo.