Rent Sword Art Online 24 (light novel): Unital Ring III

Synopsis

A reunion with Seijirou leads Kirito, Asuna, and Alice back to a version of the Underworld where 200 years have passed since the Great War. There, they find not only the descendants of Ronie and Tiese, but also a man claiming to be the leader of the Integrity Knights, whose eyes resemble his eyes-the one Kirito lost. Meanwhile, in the world of Unital Ring, the ultimate malice targeting Kirito and his friends finally reveals itself! 

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