Dark Horse Comics announced at its panel at Emerald City Comic Con 2018 that it will release Hiroya Oku and Keita Iizuka’s Gantz G spin-off manga starting with the first volume on June 13, 2018.
The story of the manga is described as:
Victims of a lethal bus plunge wake in a schoolroom where an ominous black sphere announces Your lives have ended. How you use your new lives is entirely up to me. Thus, a new Gantz team is sent to fight bizarre aliens that will show how the dead can die.
Gantz G in Shueisha’s Miracle Jump in November 2015 and ended on Shueisha’s Shonen Jump+ digital magazine last year after Miracle Jump halted publication.
Dark Horse also plans to release omnibus editions of Oku’s original Gantz manga in 2018.