Nobuo, the only son who grew up in the middle of a marriage that had reached a stalemate, was starved for his mother's love but was unable to interact with her properly. One day, a friend played a prank on Nobuo, and Nobuo discovered the presence of hair growing quietly in his mother's armpits. This transformed his mother into a sexual object, and Nobuo, unable to contain his swelling desire, forcefully pushed his mother down... His feelings for his mother rapidly became distorted, leading him to engage in even more obscene and shameful acts...