The story deals with Ragnarok, the death of the Norse Gods, and how the Gods try and stop it from happening.
Anyway, I must say I was disappointed with this series. The art work is good, but the manga style does not suit a story about ancient Norse gods. We know how the Vikings looked, and their Gods would have resembled them surely, so the Manga style is jarring, a Norse hero carrying a samurai sword?
Can't say it grabbed me and I love stories about Vikings.