Quiet, withdrawn accountant Kanan Amamiya is secretly a sex monster who cannot satisfy herself even by masturbating eight times a week. After uncovering employee Kita's embezzlement, she demands that he violently rape her in exchange for keeping quiet. Trapped by her blackmail, Kita becomes the sadistic cock slave tasked with fulfilling her masochistic fantasies through creampies, verbal humiliation, and oil play. Her demands keep escalating until she ensnares the company president as well, leading to an office threesome where both men cover her in semen and make her climax repeatedly.