The 3DCG film will cover the manga's Osaka Arc. Gantz: O (styled GANTZ:O) is a 2016 Japanese CGI anime science fiction action film directed by Yasushi Kawamura, produced by Digital Frontier, written by Tsutomu Kuroiwa and based on the manga series Gantz, which was written and illustrated by Hiroya Oku. It was released in Japan by Toho on October 14, 2016. Everything fits in this movie, they didn't overreached trying to tell the whole history, the whole manga; they just put a saga and run with it, telling the mechanics of the game on the run. They just missed one minor character from the manga in the Osaka saga, but it's amazing how they give even the minor characters a texture and weight, so you could understand their motives even if you didn't read the manga.