The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat (世界最高の暗殺者、異世界貴族に転生する, Sekai Saikō no Ansatsusha, Isekai Kizoku ni Tensei suru), also known as The world's best assassin, To reincarnate in a different world aristocrat,[b] is a Japanese light novel series written by Rui Tsukiyo and illustrated by Reia. It was serialized online from July 2018 to October 2021 on the user-generated novel publishing website Shōsetsuka ni Narō. It was later acquired by Kadokawa Shoten, who have published the series since February 2019 under their Kadokawa Sneaker Bunko imprint. A manga adaptation with art by Hamao Sumeragi has been serialized online via Kadokawa Shoten's Young Ace Up website since January 2019. Both the light novel and manga have been licensed in North America by Yen Press. An anime television series adaptation produced by Silver Link and Studio Palette aired from October to December 2021. A second season has been announced.