Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru  

The world's best assassin, To reincarnate in a different world aristocrat, 世界最高の暗殺者、異世界貴族に転生する, The Worlds Finest Assassin Gets Reincarnated in Another World as an Aristocrat, The worlds best assassin, 世界最高の暗殺者、異世界貴族に転生する, The Best Assassin, Incarnated into a Different World’s Aristocrat

If an exceptional assassin from our time dies, they are revived in front of a deity who proposes to respawn them in a different realm. Nevertheless, there is a stipulation attached to this resurrection: they must eliminate the champion of that domain.

Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru has been serialized online through the Shousetsuka ni Narou website since July 29, 2018. The first official volume was published on February 1, 2019 by Kadokawa under the Kadokawa Sneaker Bunko label.