Helpppp finding an anime

So 2 kingdoms are in war, an the warrior of both kingdoms have some abilities, like magical powers. Male lead is a black haired swordmaster and fl is a blondie from enemy kingdom with I think iche(?) power ? , she nicknamed a witch by enemies due to how powerful she was. And she is one of the princess of the kingdom. So there is a neutral zone where no one can fight, both kingdoms even though enemies must not attack each other there, cs of peace and stuff.
Also one of the princesses , fl's younger sister ends up liking the ml .
And at the end of season fl's mother, the queen is seen talking to her eldest, green haired princess, l think her name was ultear or smtg , idk , and after talking with her she's like "ur not ultear are you?"
So that person was not the real princess, someone impersonated her and she was somehow involved in the rifts with the other kingdom.

Someone pls tell me what the name was I was released in 2020 I think