Kairo (2001) by Kiyoshi Kurosawa
aka: Pulse

Another cloud of mysterious suicides and disappearances darkens the sky over Tokyo. When Michis (Kumiko Aso) friends and colleagues disappear one after the other, leaving behind nothing else than strange black stains on the ground, she can’t help but investigate the scary incidents. And every trace seems to have just one entry respective exit: the red taped door…

seen at: pickledfeet private videothek