The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat, Vol. 1 (light novel)

“I’m going to live for myself!” The greatest assassin on Earth knew only how to live as a tool for his employers-until they stopped letting him live. Reborn by the grace of a goddess into a world of swords and sorcery, he’s offered a chance to do things differently this time around, but there’s a catch...He has to eliminate a super-powerful hero who will bring about the end of the world unless he is stopped. Now known as Lugh Tuatha Dé, the master assassin certainly has his hands full, part...