Emi Yagami diligently works out at the gym, striving to build her physique. She begins training under a perverted, erotic trainer who introduces her to an unusual workout regimen unlike anything found in regular gyms. Enduring his lewd and humiliating exercises, Emi gradually transforms her body. Though initially pained by the intense training, that pain slowly turns into pleasure, fulfilling both her body and mind. In the end, she gulps down the semen protein, achieving a sexy, aroused physique.