Hisayo Nanami is a widow living with her only son, a highly acclaimed female author whose literary talent and popularity bring constant offers for new serialized works from publishers. Yet she refuses to compromise her standards, rejecting every proposal. One day, a persistent editor uncovers her secret: she's addicted to vibrators and indulges daily in bizarre, deviant masturbation. Yielding to the editor's relentless pressure, her true nature as a complete masochist is exposed, leading her into a life of sexual slavery. Eventually, she confesses her deepest desire to the men around her—the wish to realize an incestuous relationship with the person she loves most: her own son.