Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru

The story

Synopsis

After a lifetime as the world's deadliest killer, a man is unexpectedly given a second chance in a realm of swords and sorcery with a single, impossible task: stop a savior who may spell ruin for the kingdom. Reborn into an aristocratic house of assassins, he must relearn his craft in a very different way while balancing duty, honor, and the weight of his o…