Gantz manga volume 12 contains volumes 34-37 in an omnibus format and features story and art by Hiroya Oku.

While the truce with the alien invaders crumbles, Gantz warrior Kei races to save his beloved Tae aboard the alien mothership before the goliath vessel is consumed in the rapidly spreading destruction. But beyond Tae’s desire to reunite with Kei is her hope that Kei can prevent a Gantz-led genocide of the aliens!