Gantz (Japanese: ガンツ Hepburn: Gantsu) is a Japanese manga series written and illustrated by Hiroya Oku. Gantz tells the story of Kei Kurono and Masaru Kato, both whom died in a train accident and become part of a semi-posthumous "game" in which they and several other recently deceased people are forced to hunt down and kill aliens armed with a handful of futuristic items, equipment, and weaponry. Both the manga and anime are noted for their heavy violence and sexual content. Pretty good anime, in my opinion. It's somewhere around 24 episodes. I enjoyed the ending, but I can see why some people wouldn't like it. 8/10