best friend, Kato fights the one hundred point alien Nurarihyon which obliterates both Osaka and Kurono's team. At the end of the mission, similar to the first time Kato died, he defeats arguably the strongest alien in the series and is laid bleeding on the floor. The series depicts both the missions and Kurono's regular life, as well as the daily lives of other Gantz players (to a lesser extent). After several missions, an old participant named Nishi, who knows more than the others about how Gantz works, shows them a "catastrophe countdown" on the Gantz sphere which the other players were unaware of. The countdown reveals that there is one week left until some unknown "catastrophe." At the end of that week, a massive alien force invades the Earth and begins exterminating the human race, while Kurono and his companions try their best to make use of Gantz' advanced technology and weaponry in defense. At the end, Nishi and Kurono are depicted to be similar, both of whom were despised by their family and were sinister; however, unlike Nishi, Kurono has a reason to live. Nishi, in the chapter "The Great Escape", is left for dead by Kurono, vowing vengeance against him and crying out for Gantz and mother for help. It is hinted that Nishi died, but his death seems to be unclear. The Japanese also learn of the existence of Gantz teams all around the world. After a long battle, the humans manage to stop the alien invasion and soon after, it is revealed that it was another, highly advanced alien species that provided mankind with the means to defend itself against the invaders, for reasons they refuse to reveal, calling it a whim. In a desperate last effort, the leader of the alien forces, Eeva, challenges the whole human race, promising to exterminate every inhabitant by himself by crashing their mother ship, killing both races if Kurono does not come to their mother ship to fight him. Prior to this announcement Eeva completely dominates all Gantz teams in his vicinity by killing all the hunters, giving the human race a sense of their mortality. The world calls on Kurono, which is broadcast to the entire world, and, with a revived Kato's help, Kurono bets all his chance of winning and saving the human race on himself. Kurono manages to defeat Eeva, thus preventing the alien mothership