The Demon King's Daughter is Too Kind!! Maou no Musume wa Yasashi Sugiru!! English Subbed

Once feared as the ruler of all demons, Demon King Ahriman seeks to conquer the world…until he’s stopped by an unexpected force: his daughter, Dou! Too kind for chaos and too gentle for war, Dou melts the hearts of demons, humans, and even angels. Desperate to restore demon pride, Ahriman’s aide Jahi vows to train Dou to become a proper demon. But is Jahi any match for Dou’s compassion?!

(Source: Crunchyroll)