Hyakuren no Haou to Seiyaku no Valkyria  

norsekai, The Master of Ragnarok & Blesser of Einherjar, 백련의 패왕과 성약의 발키리, 百炼霸王与圣约女武神, 百錬の覇王と聖約の戦乙女[ヴァルキュリア], Hyakuren no Haou to Seiyaku no Ikusa Otome, 百錬の覇王と聖約の戦乙女〈ヴァルキュリア〉

The story revolves around yuuto suou and his friend mitsuki shimoya testing an urban legend. however, things take a turn when yuuto takes a picture of himself with a divine mirror at a local shrine using his smartphone. he is then transported to another world that heavily incorporates norse mythology. with the knowledge he has gained from school and his solar-powered phone, yuuto can bring the wolf clan to prominence and earn the admiration of a group of powerful warrior maidens known as einherjar.