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

is the first 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 March 2016.

Synopsis
[Sword Saint] who made various loves and battles. The only silver bullet is the one who screams in a rainy day !? There is a different world of swords and magic, and waiting is a huge underground labyrinth. Beatrice, who managed the magic and climbed to the strongest position in a game-like manner that is far more familiar than spells and magic circles, was worried. "Bugogo !! Bushururu ... Munyamunya ..." "BuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuBuu!?" What is the true identity of the legendary man "BuuBuu" who wields even the [Sword Saint] of the Kansuto group with just one nap? There will be a four-digit giant dragon and a long-lived girl who looks great, but what will happen to the whole world?

(source: Dengeki Bunko Official Website - Translated)