Night Wizard, Toaru Majutsu no Index Recommendations
Both have a relatively normal, academic underachiever high school boy with supernatural abilities having to protect a mysterious girl with a mysterious power who is introduced at the beginning of the show. There are plenty of other secondary characters in the show, some of whom are good and some of whom are evil, who have unique powers of their own. The two shows have an extremely similar feel to them.
Watch It After A While Youll Realize That They Have A Similar Stor. Like At The Begining A Girl Came Out Of Blue.