Blue Christmas (1978)

aka's: Buru Kurisumasu/Blood Type: Blue/The Blue Stigma/
UFO Blue Christmas/
ブルークリスマス

Science fiction film, concerning the paranoia that grips civilization when the blood of people who have seen UFO's begins to turn blue. The fear that these people might in fact be aliens leads to concentration camps and mass genocide. Stars Hiroshi Katsuno, Keiko Takeshita and Eiji Okada. (In Japanese language, with English subtitles).