A Certain Scientific Accelerator Vol 2

A Certain Scientific Accelerator Vol 2 by Kazuma Kamachi. A Sci-Fi manga rated Teen, published in English by Seven Seas in 2014.

Accelerator, the most powerful esper in Academy City, has lost much of his power protecting a little girl named Last Order. When a group of terrorists targets her, he steps in to fight back. A spinoff from A Certain Magical Index.