Maruhi sennyû: Gyaku soap tengoku
Movie| Title | (秘)潜入 逆ソープ天国 |
| User score | 2 |
| Release date | Oct 23, 1992 |
| Genre | Comedy |
| Director | Sachi Hamano |
| Production country | Japan |
| Production companies | Tantan-Sha Company, Xces Film |
| Run time | 60 min. |
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...
