Double Breed X

is the tenth volume of the Double Breed light novel series, written by Erika Nakamura and Illustrated by Takehito Harada. It was released under the Dengeki Bunko Imprint in May 2008.

Synopsis
Yuki Katakura, who is losing his memory, and Taichiro Yamazaki, who is possessed by "Doji Sword", collide and hurt each other without knowing each other. Will the two, who used to be more than friends, continue to fight until one of them collapses? Or ──. The conspiracy of the demon called "Lord" finally revealed and the whole picture of their plan "Ω circuit". The intention of Akira Katakura who realized his life and the meaning of the organization called "Crossbreed" to which he belongs. And the reason for the existence of a life form called "Chimera". Yuki and Taichiro. All the finals gather at the conclusion of the two. What is at the end of shedding blood, tearing meat, and crushing bones? The long-awaited final volume of the popular series is finally here!

(source: Bookwalker JP - Translated)