Gantz G manga omnibus collects volumes 1-3 of the spin-off series and features story by Hiroya Oku and art by Keita Lizuka.

Another deadly game is about to begin … When a school bus plunges off a bridge, a group of students awake to find themselves in an empty room with a mysterious black sphere. Their deaths have made them the newest recruits in a hunting game. Given weapons, uniforms, a mission, and an ultimatum, the team is sent to battle waves of aliens where they must earn enough points to be resurrected before dying permanently!