Mao, a female office worker at a certain company, secretly belongs to a high-class M-fetish club where she indulges in the bodies of perverted M men, even going as far as playing with their anuses. But that's not enough for her insatiable desires. She also treats a male colleague as her pet, secretly enjoying her masochistic play even during office hours. One day, her boss, the department head, stumbles upon a M-fetish girl who looks exactly like Mao on an adult website... A man who visits the M-fetish club where Mao works as a client ends up being penetrated to his very core by his subordinate Mao's lewd techniques!