Maruhi sennyû: Gyaku soap tengoku
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...
- Year: 1992
- Country: Japan
- Genre: Comedy
- Studio: Tantan-Sha Company, Xces Film
- Keyword: softcore, pink film
- Director: Sachi Hamano
- Cast: Koyuki Fuji, Jun Yahagi, Kaori Kuwabara, Kan'ichi Hiraga, Masahiro Yoshida, Ryou Kurihara