"Senkō no Prisoner" (閃光のPRISONER) by Yuuka Nanri, opening theme for Mahou Sensou anime series.
Magical Warfare (魔法戦争) is a Japanese light novel series written by Hisashi Suzuki and illustrated by Lunalia. As of July 2013, 6 volumes have been published by Media Factory under their MF Bunko J label. A manga adaptation by You Ibuki started serialization in the manga magazine Monthly Comic Gene on April 15, 2013. An anime television series adaptation by Madhouse began airing from January 9, 2014.
When Nanase Takeshi, a regular high school student, encounters Aiba Miu, a girl from a world of destruction, he winds up getting involved in a grand battle between mages. In order to save Miu, in order to save the world, and in order to change destiny. A real, modern-day magical action story begins now.