A Certain Magical Index

A Certain Magical Index by Kazuma Kamachi and illustrated by Kiyotaka Haimura is a manga I'm sure I read before. Scrolling through FUNimation's channel on youtube.com I came across it and from just reading the summary I knew I did. It was interesting and I felt like I was opened to a different world (even though it similar to our own).

Genres: Action, Adventure, Fantasy, Sci- fi

Summary:
 
In a world where magic is as real as science, high-school student Kamijo comes to the aid of a young nun named Index. She's on the run from a magic society that covets the massive library of forbidden knowledge stored in her memory.

Watch it here on Youtube.com :3

Picture found on Google*
Summary found on Youtube.com*