Sekai Saikyou no Assassin, isekai kizoku ni tensei suru, Sekai saikō no asashin, isekai kizoku ni tensei suru, The Best Assassin, Incarnated into a Different World’s Aristocrat, The World’s Best Assassin, Reincarnated in a Different World as an Aristocrat, 世界最高の暗殺者、異世界貴族に転生する