Gantz

Based on the hit sci-fi action thriller manga by Hiroya Oku. Kei Kurono and his friend Masaru Kato attempt to save a man in the subway but are hit by an oncoming train. However, rather than finding themselves dead, they are transported to a strange room with a mysterious black orb known as Gantz. Along with other there, they are provided weaponry and sent on missions to battle alien beings. Their will to survive will be tested. (official distributor synopsis)