Gantz Omnibus (Manga) (Paperback) Vol 04

Kei Kurono's work as a Gantz fighter is a nightmare, but his personal life is looking up, with a new ladylove opening his heart. But when his beloved is threatened by a Gantz-obsessed schoolmate on a shooting rampage, Kei must face the killer without his Gantz suit for protection! Dark Horse Comics
(W/A/Ca) Hiroya Oku