Sakura hime

On the eve of her marriage to a prince she has never met, fourteen-year-old Princess Sakura is attacked by a youka, a kind of demon, while gazing at the moon. After the attack, she discovers that she is the granddaughter of a Moon princess who slew demons with her sword, Chizakura, and finds that she can summon the sword and use its power to defend herself and others from demons.