Dokumushi: Toxic Insects (2016)
Original title: ドクムシ
Dokumushi: Toxic Insects is a 2016 Japanese-language horror movie directed by Kayoko Asakura, with a running time of 1h 38m. It stars Ryouta Murai, Rina Takeda and Shintaro Akiyama.
7 strangers are locked up in building. There is nothing to eat in the building. They see a big stock pot, a butcher‘s knife and a watch to count 7 days. The 7 strangers are locked in the building for 7 days and they have to kill each other until there is only 1 person left. The 7 people go insane due to hunger and stress.