A young man decides one day to start killing yakuza. After he kills his first two he gets roped into helping a wannabe gangster and his bumbling underlings to perform a hit. While things work out in the beginning, this young psychopath quickly becomes more trouble than the gang expected. Will they be able to rid themselves of him, or will they be his next victims?

Capable of making bio-mechanical weapons out of human flesh, alien parasites grotesquely invade the Earth, turning their hosts into maniacal killers who seek and destroy each other to the bloody death! And yes, it s also a human love story, even though the budding romantics are infested with slimy, tumor-like globules.