Manga Gantz

Aren't satisfied with your life? Death is not the way out. It's pointless to count on salvation, there is no god that will protect your soul. Who is god? Probably, it's a huge black ball that is in your room! Throw into a game full of ugly aliens, monsters that you have to fight with. After the death of Kei Kruno, he becomes a hero of this game. Time to check your morals and skills to stay alive. It's not his life anymore, either the death. What can happen if he ignores? Only God knows.
Warning: Gantz is only for strong-willed people. Raping, violence, crimes, and other ugly moments. Is it the real reflection of modern society?