Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru

The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat

A legendary assassin gets a second life in a world of magic and noble bloodlines, where his lethal expertise finds new expression. It's a premise built for tension, though the pacing occasionally stumbles.

The world's number one assassin has been reincarnated as the eldest son of a family of aristocrat assassins. In exchange for being reincarnated in another world, a goddess has imposed upon him one condition. "Kill the Hero who is prophesied to destroy the world." This was to be the mission in his new life. The synergistic effect of the vast knowledge and experience he gained that made all manner of assassinations possible in the modern world, and the secret techniques and magic of the fantasy world's most powerful family of assassins turn him into the greatest assassin of all time. (Source: Crunchyroll)