Hyakuren no Haou to Seiyaku no Valkyria

Yuuto Suoh experiences unexpected consequences after participating in an urban legend with Mitsuki Shimoya. After taking a photo of himself with a divine mirror at a local shrine using his phone, he is transported to a world rooted in Norse mythology. Equipped with knowledge from school and his solar-powered smartphone, he seeks to elevate the Wolf Clan, who once looked after him. His efforts attract the attention of the Einherjar, a group of warrior maidens who wield magic.