Gantz EP2 - They Aren't Human

The Black Globe suddenly starts playing a 1940s radio exercise tune, interrupting Katou and the Yakuza fighting. The globe tells them to kill Neigi Seijin (green onion alien). The globe opens up, revealing guns and suits. The men take the guns but ignore the suits, except Kei who puts one on. Kei is thrown into the deadly "game". Everyone goes off looking for the alien after Nishi shows them a GPS indicating the alien and tells them that there is a reward for killing it. Kei, Katou, and the girl go off on their own trying to find a way home. The politician tries to get home, but his head inexplicably blows up after a while. The Yakuzas, schoolteacher and the blond man find 'Neigi Seijin', who is a young boy with an affinity for spring onions. He runs and they chase him, eventually killing him with the guns they received from Gantz. The boy puts up little resistance and is very weak, but we see his father come into the scene looking enraged at what has happened.