Although she had been a promising practitioner of kendo in the past, due to an accident she was forc...
Selena, who used to be a normal Korean girl who practiced kendo, was reborn as the sister of the villain's knight. However, in her new life, her brother runs away from his duties and she has to stand in his place
Good thing she practiced kendo!
I think the mc fits the archetype of the dense or oblivious one, which I don't mind.