Meatball Machine (2005).

“Yoji is a lonely guy with no friends or girlfriend who works at a small factory. However, he secretly falls in love with a girl named Sachiko who works at a factory across the river. Both have secrets within them and gradually become attracted to one another. In the mean time, mysterious objects quitely invade the earth. They parasitize human beings and tranform them into hideous monsters. In order to survive, the so-called “Necro-borg” fights each other until the other dies. The Necro-borg’s next target was Sachiko. What are their purposes? What will happen to Yoji and Sachiko? Their fierce battle for survival begins…”