O | Gantz:

: Bring back a fallen comrade from Gantz's memory. Upgraded Gear : Trade points for more powerful weaponry. Visual Spectacle and Creature Design

The film follows , a selfless young man who dies while trying to save someone at a subway station. He awakens in a room with other "dead" people and a black sphere that provides them with futuristic suits and weapons. The participants must eliminate aliens within a one-hour time limit; failing to stay within the designated zone results in instant death via head explosion. Gantz: O

: Players earn points for kills. Reaching 100 points offers three choices: Freedom : Return to normal life with memories wiped. : Bring back a fallen comrade from Gantz's memory