Tenku no Arcamiles (Volume)

is the first volume of the Tenku no Arcamiles light novel series, written by En Mikami and Illustrated by Sumi Keiichi. It was released under the Dengeki Bunko Imprint in April 2006.

Synopsis
Behind the prosperous human civilization, the dark genus that was supposed to be quietly buried in history-the "beast". But the "warfare" brought by someone changed their destiny. There was no way for humankind to do it in front of Terion, who regained his original power and instinct and became a hunter again. Takuya Shinomiya is an ordinary high school student who attends a private Todo school with Reina who grew up like a brother and sister. However, from the time he was fascinated by his transfer student, Kuji Hinako, his daily life collapsed. The shadow of the terion jumping into the city, Hinako who is chasing the terion. And when Takuya and Reina regain their lost childhood memories, the wheel of fortune begins to turn! The first in the action horror series.

(source: Bookwalker JP - Translated)