Maruhi sennyû: Gyaku soap tengoku
- Genre : Comedy
- Année : 1992
- Réalisateur : Sachi Hamano
- Acteur : Koyuki Fuji, Jun Yahagi, Kaori Kuwabara, Kan'ichi Hiraga, Masahiro Yoshida, Ryou Kurihara
- Pays : Japan
- studio : Tantan-Sha Company, Xces Film
- 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...
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