Gantz is based on a hit manga series created by Hiroya Oku and stars leading Japanese actors Kazunari Ninomiya (Letters from Iwo Jima) and Kenichi Matsuyama (Death Note, Detroit Metal City).

Gantz
After an accident on the train platform, recently deceased childhood friends Kei and Kato find themselves transported to an empty apartment populated by other confused strangers and a mysterious black ball known only as Gantz, which issues them a set of strange suits and alien weapons, instructing them that their lives are forefit and now they must exterminate "dangerous aliens" from Earth in a series of games.

Gantz: Perfect Answer
Perfect Answer begins several months after the events of the first film. Kurono (Ninomiya Kazunari) is still fighting aliens under the order of Gantz and he is close to reaching the score he needs to resurrect his friend Kato (Matsuyama Kenichi). As the missions begin to get increasingly dangerous for both the alien fighters and the general public, Kurono discovers that the endgame for Gantz is quickly approaching.