A 50 year-old nebbish debt collector, Yuji, is having a pretty bad week. Yuji tries to turn his life around and meets the young and beautiful Kaoru. However, a gigantic alien jar falls from the sky, trapping thousands of people. Alien parasite start to change people into hideous monsters (Necro-borg). The Necro-borg fight each other until the other dies. Yuji retains his human consciousness and joins forces with a team of cops to save Kaoru from a city full of Necro-borgs.