Maruhi sennyû: Gyaku soap tengoku
(秘)潜入 逆ソープ天国
Maruhi sennyû: Gyaku soap tengoku at SFlix. 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...
- Genre: Comedy
- Country: Japan
- Director: Sachi Hamano
- Cast: Koyuki Fuji, Jun Yahagi, Kaori Kuwabara, Kan'ichi Hiraga, Masahiro Yoshida, Ryou Kurihara,