The strongest assassin, known by the nickname "Killer Bee," dies in a reckless quest for revenge after the murder of their younger sister. However, their soul did not vanish; it reincarnated as Liese, the antagonist and villainess of an otome game! To change the fate of Liese, who meets a tragic death in every single route of the game, the strongest assassin wields their blade once again in this second life――!!