Red Secret Room 2

Red Room 2 is a 2000 Japanese V-cinema (direct-to-video) horror film directed by Daisuke Yamanouchi. It is the sequel to the 1999 film Red Room. Like its predecessor, the film revolves around four contestants on a reality TV game show who, as per the game rules, enact a series of tortures on each other in order to be the last person standing for a cash prize, with the tortures gradually escalating into extreme sadism and sexual abuse.

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

Poster © the film's rights holders.