Death does not have to be the end; one can live again, but only by beating the game posed by the black ball called Gantz. On his way home to celebrate his younger brother's birthday, the brave and kind-hearted student Masaru Katou is stabbed to death. He awakens in a small room with a view of the cityscape in the heart of Tokyo—and he is not alone. To his surprise, it is not the afterlife, but the waiting room for a high-stakes game with their lives on the line. Before he has the chance to process the situation, Masaru is handed a gun and teleported to the center of Osaka to carry out one simple task: eliminate any alien on sight. Accompanied by the aged Yoshikazu Suzuki, the stunning idol Reika Shimohira, and the cold but experienced Jouichirou Nishi, Masaru must overcome his fears in order to survive the game and return home to his waiting brother.