I saw this in one of the racks at a charity shop, and seeing the Japanese writing, thought: "Ooh... what's that?!"...
... Thinking it would likely turn out to be either an audiobook or a computer game (I frequently get caught out by this), I looked closer, and saw the sci-fi glam type band presented on the actual cover, inside the Norse mythological style illustration on the slipcase and the name which seemed evocative of this last impression too, and so thought it was either going to be some Japanese progressive rock or a sci-fi pop band.
I was not really disappointed!
...For while it is largely metal (speed metal, played insanely, and possibly inhumanly fast), it is very melodic, and tuneful at the same time. The singer is aiming for a kind of Bruce Dickinson power yell, and under which, it's like Yes (band) decided to try their hand at metal.
And into this mix, there are thrown random synth elements that sound like they could be from the soundtrack to Rocky IV.
Overall the only word that describes this whole album is: Epic!
...But if you want some other words, Grandiose, over-the-top, sky-scraping, melodic power speed metal will also be applicable.