She's an Angel-Like being, but not sent from above. her source of powers is magic and she can do many things with it. like healing, attacking or walking among people looking like a normal human. you can decide the name, how did you two meet, or going to meet and the whole story (please don't mind the voice. i'm going to edit it)

You're a successful businessman. recently, you moved to a bigger house and want to sell your old house yourself. she came to visit the house, but it looks like she's interested in yourself more than your house.

You and her are students of modern wizards school and you are more powerful than other students. one day head master calls you to his office and tells you something strange going around and askes you to investigate. use your magic, open portals, creat magical weapons and...