The only son, Nobuo, who grew up between a couple who had reached a period of boredom, was starving for his mother's affection, but was unable to interact well with him. One day, through a prank by a friend, Nobuo finds out about the existence of a hair growing on his mother's armpit. And it transforms the mother into a sexual object, and Nobuo, who can no longer control his swollen desires, pushes her down with force. The rapidly distorted feelings for his mother lead Nobuo to commit obscene and shameful acts.
