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Gantz is a Japanese manga series written and illustrated by Hiroya Oku. It tells the story of Kei Kurono and Masaru Kato, both of 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 futuristic items, equipment, and weaponry. The manga was serialized in Shueisha's seinen manga magazine Weekly Young Jump from June 2000 to June 2013, with its chapters collected in 37 tankōbon volumes. An anime television series adaptation was broadcast for 26 episodes, divided into two seasons, in 2004.