Reiko, the mother, has begun to think of her beloved son Koji as a man, even though he has grown up fine. Even though she knows it's wrong, she can't suppress her rising lust, and whenever she gets the chance she uses obscene words and behavior to seduce him, but he doesn't respond at all. Frustrated, Reiko can no longer contain herself and shows him her own lewd behavior... Since that day, Reiko has completely changed her attitude and started to treat Koji, who has begun to think of his mother as a woman, coldly. Unable to bear the constant waiting, Koji finally...