High Quality Content by WIKIPEDIA articles! The anime series Gantz is an adaptation from the manga with the same name written and illustrated by Hiroya Oku. The series, produced by Gonzo and directed by Ichiro Itano, aired in Japan on Fuji Television and AT-X.Gantz tells the story of a teenager named Kei Kurono who dies in a train accident and becomes part of a semi-posthumous "game" in which he and several other recently deceased people are forced to hunt down and kill aliens hidden in Japan.