Hotaru, a transsexual who works as a dominatrix at an SM club every night, toying with masochistic men and making them addicted to the pleasure of reverse anal play, joins a company under a hidden identity as a daytime worker. At the company's office, Hotaru finds a colleague who happens to be a masochistic man she's played with at the SM club she works at! Taking advantage of the man's weakness when he's nervous, Hotaru plays with her coworker in the office, and even makes her boss, the department head, her pet. Hotaru then gets her coworker involved in reverse anal play with the department head in the office, and they engage in forbidden acts...!