In a posh sports gym located in Tokyo, Yuna Mitake, a stunning beauty and skilled instructor herself, arrives for her interview. After practicing with machines, she's given a mysterious protein drink that renders her unconscious. When she wakes up, she finds herself imprisoned and being brutally fucked by both the owner and trainer. They subject her to relentless throat training involving multiple penetration, machine bondage, and intense blowjobs until she submits completely. Despite her strong resistance at first, deep down inside, this submissive woman craves to be dominated and used as men's plaything. Her true nature as a masochist eventually shines through. Note: Content may vary depending on distribution method.