The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat, Vol. 6 light novel

At long last, the academy has finished repairs after the first demon attack, and Lugh returns to school. What awaits him is a wild request from his upperclassman, Nevan Romalung. She tasks him with killing demons impersonating the Pope of the Alamite Church! Monsters and villains are one thing, but to assassinate the leader of the largest religion in the world is a very different story...