College student Karin visits a beauty spa for the first time after a friend recommends it, hoping to look prettier for her boyfriend. He compliments the results, so she decides to keep going, unaware that a predatory therapist has been targeting her. He spikes the oil with an aphrodisiac and makes her climax through obscene massages. Karin vows never to return, but she cannot forget the pleasure; dazed with desire, she finds herself walking back to the same salon...