Terrifying Girls' High School: Lynch Law Classroom

Terrifying Girls' High School: Lynch Law Classroom is a 1973 Japanese film in the sukeban subgenre of Toei's "Pinky violence" style of Pink film. The second in the Terrifying Girls' High School series, this was the last entry in the series directed by Norifumi Suzuki and to pair Reiko Ike and Miki Sugimoto. It is notable as the first film to depict an omorashi fetish scene to a theatrical audience, in which a girl is forced to drink a lot of water and then is denied permission to go to the toilet, forcing her to wet her skirt in class.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.