MC(female) reincarnates into another world(can’t remember if it was a villainous type story) and decided to change her way of life(can’t remember if it was hers or the person she reincarnated as). The story starts off since her birth, she’s talented at magic and makes friends with a prince(or some other high nobility child) by defending him when she him getting bullied. She’s a magic fanatic researching, getting to the point of covering herself in magic tattoos that make her practically invulnerable to conventional means of harm. Due to these tattoos, she doesn’t have a very good reputation in high society. She attends some kinda school(forgot what for). It was a Japanese web novel.