"Gantz" is a critically acclaimed Japanese manga series penned by Hiroya Oku. Serialized from 2000 to 2013, the narrative revolves around Kei Kurono and Masaru Kato. Following their death in a train accident, they're thrust into a surreal game where they must hunt and exterminate aliens. The gripping storyline of "Gantz" has been adapted into various formats such as an anime television series, two live-action films, and a CGI anime film.