The technology to create powerful cyborg soldiers has been released for public use by the Berühren Corporation. Those outfitted with robotic parts are known as the Extended. Juuzou Inui, one such Extended, was created as a soldier and has no memories of his former life. But now, after the war, he runs a business that takes care of Extended-related incidents around the city. Rumors of a renegade Extended that kidnapped a child reach his ears; lo and behold, as Juuzo returns to his office, a giant robotic man with a boy on his back crashes in, asking for help. While Juuzou could just turn the guy in and be done with it, something about this situation is too fishy to ignore. It seems that everyone wants hold of this kid and, whether he likes it or not, Juuzou must find out why this Extended is on the run, how it connects to the Berühren Corporation, and just how far the treachery runs in this city.

Seemingly an average man, Joe Logan leads a peaceful life in the countryside with his wife and child. However, the Logan family have actually assumed false identities to escape from Joe's past as a fearsome ninja assassin. Despite a string of high-profile murders of his former peers, Joe is sure that his new life is secure—but his tranquil bliss is soon shattered when his family is slaughtered by members of his former clan. Left for dead, Joe wakes up in a hospital, unsure of how he survived the wounds that should have killed him. Police detectives Emma Samanda and Mike Moriss, assigned to investigate the Logan family's deaths, witness another attempt on Joe's life. However, this time Joe is prepared. Unleashing secret techniques, he easily dispatches his enemies, shedding his new identity in the process. Embracing his old ways, Joe shrouds himself in his former persona, cutting through the organization he once served in the name of cold-blooded revenge. Assisted in his hunt by the detective duo, Joe will stop at nothing to kill his past and the demons hailing from it.

Death does not have to be the end; one can live again, but only through beating the game posed by the black ball called Gantz. On his way home to celebrate his younger brother's birthday, brave and kind-hearted student named Masaru Katou is stabbed to death. He awakes in a small room with a cityscape view in the heart of Tokyo—and he is not alone. To his surprise, it is not the afterlife, but the waiting room for a high stakes game with their lives on the line. Before he has the chance to process the situation, Masaru is handed a gun and teleported into the center of Osaka to carry out one simple task: eliminate any alien on sight. Accompanied by the aged Yoshikazu Suzuki, the stunning idol Reika Shimohira, and the cold but experienced Jouichirou Nishi, Masaru must overcome his fears in order to survive the game and return home to his waiting brother.

In a dystopian future, detective Shinjuurou Yuuki—known by some as the Defeated Detective—solves mysteries throughout Tokyo. Aided by his odd associate Inga, Shinjuurou's insight and ingenuity in cracking cases, particularly homicides, lead to numerous mysteries solved and culprits caught. However, his partner seems to have some other, more sinister intentions for the people they catch, and the truth of the assistant's identity and motivation is shrouded in secrecy.