Mako, working as the company president's secretary, is suddenly summoned to the president's office one day. She is given the abnormal demand to perform a blowjob as part of her secretarial duties. Forced to wear a collar, she is treated like a pet, gradually having her mind and body conquered. However, one day, she experiences the nightmare of being raped by the president's son. This terror and humiliation deliver a profound shock to Mako.