Gantz manga volume 6 contains volumes 16-18 in an omnibus format and features story and art by Hiroya Oku.

Once a fearful conscript into the team of warriors armed and deployed by the mysterious Gantz orb, Kei Kurono is born-again hard in the invisible war against an endless stream of bizarre alien invaders. But the off-world intruders are now taking human form, and even a friend may be a foe!