Sekai Saikou no Ansatsusha
Other Name: The world’s best assassin, To reincarnate in a different world aristocrat, Ansatsu Kizoku, 世界最高の暗殺者, 異世界貴族に転生する, The World’s Finest Assassin Gets Reincarnated in Another World as an Aristocrat, สุดยอดมือสังหาร อวตารมาต่างโลก

Genres: Anime, Action, Drama, Fantasy, Mystery, Romance
Episodes: 12
Country: Japan
Author: Rui Tsukiyo
Network:
Released: Oct 6, 2021 to Dec 22, 2021
Related Show: 

Synopsis:

A former top assassin was killed when he was old. The goddess had given him a chance to be reborn. Assign the pre-quest Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru to slay the heroes who are about to lead the world to ruin. He was reborn into an assassin noble family and developed rapidly.