Moto ansatsusha, tensei shite kizoku no reijo ni narimashita. (Associated Names)

A certain assassin who failed her mission was reincarnated as Serena, the daughter of a duke. “I used to be an assassin, so it’s easy to pretend to be someone else.” —Or so Serena thought. Soon, reality came crashing down. Her mother was a naive airhead, while her stepsister was a scheming girl who deceived…