Guinea Pig Unofficial – Lucky Sky Diamond (1990)

AKA: Rakki Sukai Daiamondo, Bloody Fragments on a White Wall
Year: 1990
Directed by: Izo Hashimoto
Starring: Naoko Amihama (Yoko), Reiko Nakamura (Woman), Shiro Sano (Doctor)
Country: Japan, Asian Cinema
Language: Japanese
Runtime: 00:58:59
Genres: Gore-Splatter, Insects, Body Modification, Violence against Women, Bizarre, Captivity-Kidnapping, Torture, Medical

Plot – Spoilers:
A woman wakes up in what looks like a hospital bed. As she explores the room, she notices surveillance cameras and other aspects which fill her with terror and induce gory delusions. A doctor and a woman burst into the room and appear concerned for her and calm her down. The woman seems like she could be a sister or friend. But soon, the masks slip off and the pair turn out to be a sadistic couple who’ve abducted her while she was out shopping. They proceed to torment her in strange ways including experimenting with her brain. From here onward, Lucky Sky Diamond enters the bizarre with a Man in the Box appearing on the scene and more WTFery. There’s also an excruciatingly grating long shriek by the Doc’s partner that’s worth waiting for.

If you have a clue what the ending is all about, do leave a comment. The only thing we could think of was, all that poking at her brain mixed up things and she was aroused and attempting to fellate the bottle.