Maruhi kaiten gyaku soap (1993)

Synopsis

One day, a young man met a woman hanging out in a park and lent her a magazine without checking her ID, but when she returned it, she informed him that a man had run away with her money. Realizing that she had no money, the young man took the loan of this book as a cue and told her that he was working on a business trip to do some reverse soap, and she carefreely told him about her background, saying that she had also worked as a prostitute. The young man wanted to see if her technique would work on a professional woman, so he gave her a reverse soap for free...