Fate:Lost Einherjar - Kyokkou no Aslaug

Aslaug is the daughter of dragon-slayer Sigurd and valkyrie Brynhild. She long slept under the great harp of magical silver, and what awaited her upon her awakening was a world of men without gods. The Scandinavian Peninsula of the 9th Century. There she had a fateful encounter with Ragnar, young warrior of the vikings, the bold men who claim to serve the disappeared Norse gods and to be braves deserving of guidance to Valhalla.
This truly was the chance meeting between the last Valkyrie and the last Einherjar.