A university assistant professor spends his days researching. A hidden camera is installed at a reverse soap shop run by a friend of his, and he studies techniques by observing the reactions of female customers...

Shuichi, a photographer for an erotic magazine, is drawn to a woman in a submitted video that arrives at the publishing house. Using the postmark on the envelope as a clue, he tracks down a woman who resembles her. The woman, Sayoko, denies being in the video, but asks for Shuichi's phone number...