Saikyou wo Kojiraseta Level Counter Stop Kenseijo Beatrice no Jakuten (5) Sono Na wa "Buu Buu"

is the fifth volume of the Saikyou wo Kojiraseta Level Counter Stop Kenseijo Beatrice no Jakuten Sono Na wa "Buu Buu" light novel series, written by Kazuma Kamachi and Illustrated by Mahaya. It was released under the Dengeki Bunko Imprint in August 2017.

Synopsis
Beatrice and his friends saw hope in how to save the souls of [Iberico Orcs] from [Hyoki] possessed by Boobu with the girl-type weapon Abyss. However, the key [Underworld] was an unimaginable threat to them! The undeath army that revives many times is approaching from the [Netherworld], which looks like a giant marine creature that has half rotten. [Break News] Humans are leaving the different world in a situation where even total mobilization cannot stop it. However, the possibility that the army of [Underworld] will invade the earth increases, and Beatrice, who is targeted by the government and the military, returns to Grands Neil to capture [Underworld] with Boobu and others!

(source: Dengeki Bunko Official Website - Translated)