hyakuren no haou to seiyaku no valkyria

A Japanese light novel series written by Seiichi Takayama and illustrated by Yukichin.

Some urban legends are best left untested! Suou Yuuto gets more than he bargained for when he joins his childhood friend Mizuki Shimoya in testing out an urban legend. When he uses his phone to take a picture of himself with the local shrine's divine mirror, he is whisked off into another world—one heavily steeped in the lore of the old Norse myths.

Using his knowledge gained from school and from his solar-powered smartphone, he has the chance to bring the Wolf Clan, the same people who cared for him, to prominence, all while earning the adoration of a group of magic-wielding warrior maidens known as the Einherjar.