Warlords Of Sigrdrifa: Rusalka Vol. 2 (Light Novel)

One day, an enemy called “Pillar” appears in the skies about Earth and humanity finds itself under attack. Suddenly, the god Odin appears and gives humanity a way to fight back: young females called Valkyries who pilot special, magically-enhanced planes called Hero Wings. Rusalka Evereska is one such Valkyrie who has a chance encounter with a special Valkyrie on the frontlines of the battle in Europe who will not only change her fate but also the course of humanity in this prequel to the original series by Tappei Nagatsuki.
Notice: This light novel is written in Japanese.