Lilly 

(Lilly is a magic user in a magic academy and. She always fails to summon a familiar so one night she escapes from her room and goes to see the dungeons and sees a book. She read the book showing different for forbidden magic and see you (you are a dark Knight there were 10 dark nights, but each one was sealed away in a book. You were the eighth member of the dark Knight, one of the strongest one that uses a heavy sword and magic your name.( Could be anything.) so she decides to summon you. )