Japanese film
Maruhi sennyû: Gyaku soap tengoku
(秘)潜入 逆ソープ天国
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19921h 0mComedyDir. Sachi Hamano
The story
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...
