[summary obtained from http://en.wikipedia.org/wiki/Karas_%2...With Otoha a human again, Homura decides to take remedial action as the new official Karas. Otoha, who saves the gravely injured Nue by giving blood, learns of the approaching cataclysm that Eko's working for. However, Nue advises Otoha to forget everything and resume his old life, with Nue intend to atone for the Mikuras' actions while saving his younger brother from Eko's grasp. Though Nue thought to have a adventage in killing the Yurine he made a pact with, Eko actually devised a means to remain a Karas and defeats Nue before revealing the part he and his brother are to play. Taking Nue's advice, Otoha returned to Kabukichou, where he finds his friend Reiji being held captive by the yakuza. Otoha kills his father, the yakuza boss, after Reiji dies.Eko ravages the city with his monstrous machine powered by Nue and his brother's electricity, its tendril roots killing many humans and absorbing their blood while barricading the city to ensure no escapes or interferences. Shinjiku gathers survivors in various shelters throughout the city. Shinjiku, who is pushing Yoshiko in a wheelchair, meets with Kure and Sagisaka, who had come to search for his daughter. In the underground shelter close by, Kure finds Hinaru there as well while Shinjiku reveals his true Mikura form and begins eating the survivors. Shinjiku was about to attack Yoshiko, but Sagisaka sacrificed himself to save his daughter. Otoha, who had been in the group with a little girl he saved, fights Shinjiku with his sword to allow the others to escape. After surfacing, Otoha continues to fight Shinjiku but is heavily wounded when stabbed in the stomach. Shinjiku attacks Otoha and injures him greatly. As Otoha falls to the ground before dying, he calls out for Yurine. After falling to the ground, white cats come running to gather around his body and transform into glowing energy, reviving Otoha. A new Yurine arises from Otoha and allow him to resume his role as Karas, destroying Shinjiku and getting Eko's attention.The final climactic battle between Eko and Otoha finally arrives. Many other Karas throughout Japan are nearby to watch the final conflict. Aided by Homura, her Yurine partner, and his own, the battle comes to a boil when Karas is finally able to stop the raging mechanical dragon produced by Eko using his machine's tendrils. By going inside of it, Otoha, though unwilling at first, kills Nue in attempts to bring an end to his younger brother. Upon doing so, Eko's machine breaks apart as he squares off with Otoha on equal terms. Eko falls against Otoha, while his last words claim that Otoha will walk the same path as he had. As Eko's body fades he looks onto Otoha's Yurine calling out to her before he vanishes into crow feathers and one of his armored boots falls off into the sewers. The demons, now in plain sight of humans, become marked for death by the governor's aide for the chaos Eko had caused. Otoha blocks the firing squad's bullets and destroys their weapons; he and the supernatural beings fade away as he stated, while sparing their attackers, "Even you are among those under my protection." The story ends as Kure and Yoshiko head to the country to start a new life as Sagisaka requested in spirit. Homura departs back to her city while Hinaru and the young girl remain. Otoha, as Karas, continues to watch over Tokyo with crow feathers appearing to those who survived the incident and caught glimpse of the final conflict. Meanwhile, Otoha leaves a feather for Eko in the sewers where the boot had previously fallen.

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