I read this years ago and loved it but for the life of me can't remember it's title.

It's about a girl (possibly named Lucia? Or one of the characters was...) she has light hair in the manga, and is childhood friends with a boy who is part/a demon. I remember they went to a school/academy where they learnt how to fight etc, and I think the main character and another (popular but cold) girl were vying for a highly held position? I think the main character was quite attached to the friend, but as time goes on and his demonic side/destiny is revealed he leaves the school? and she (and/or the other girl) have to kill him? Possibly? The boy may have been weak/tired easily? Sorry that's all I can remember from it 😕

Thank you to anyone who helps <3

Princess Lucia?

~4400 manga completed
~1700 ongoing...