Tenku no Arcamiles V Seikon no Hi

is the fifth 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 June 2007.

Synopsis
In order to save Hinako who was taken away by Grossman, Reina decides to infiltrate the "castle" with Kaneko. Takuya and Toji were chasing them to the "castle", but waiting for them was a terrifying Grossman trap. What is the fate of the dying wounded Hinako? What is the madness that drives Grossman? What is the "holy marriage" planned by Ruslan, the "star of disaster"? The battle begins! The action series presented by En Mikami & Keiichi Sumi is finally complete.

(source: Bookwalker JP - Translated)