New Underground History of Japanese Violence: Vengeance Demon (1969)

New Underground History of Japanese Violence: Vengeance Demon 1969 / 復讐鬼 1969 / Vengeance Demon , The Revenger , Shin Nihon Boko Ankokushi: Fukushuki , Fukushûki , Fukushuuki , 新日本暴行暗黒史 復讐鬼

A brother and sister live as outcasts from their hamlet due to a belief that mental illness runs in their family. A group of villagers plot to steal their property by beating and hanging the brother and gang-raping the sister. Believing the brother to be dead, scheming to kill the sister, and making both deaths look like accidents... unbeknownst to them, the brother survives and proceeds on a mission to slaughter those responsible in the hamlet. (Source: TheMoviedb)