Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru

Synopsis

Lugh's first target as a fully trained assassin is Count Azba Venkaur, an aristocrat who has been selling military secrets to neighboring kingdoms in exchange for vizein, a drug that he distributes throughout the kingdom. Using Maha's information network, Lugh decides to investigate the count by himself and determine whether or not the target truly deserves assassination. Lugh and Tarte visit Pisear, the second-largest merchant town in the kingdom, and take down a criminal group selling vizein, but not before seeing the effects of the drug on a poor girl's mother. Sometime later, Lugh and Maha travel to the count's mansion under the pretense of selling Orna's products, which proves to be a success for Orna. As night falls, Lugh silenty assassinates Count Venkaur with his newest weapon, a sniper rifle, but takes the time to watch the grieving wife's reaction. While Lugh does not regret taking the count's life, he promises never to forget this particular mission, as it was the first assassination he performed as a free man rather than as an unfeeling tool.

(Source: Wikipedia)