It's funny that currently on Discogs there's some 20+ sub-division styles of heavy metal, but no divisions whatsoever of prog rock. Like with this, it is prog rock, but has nothing in common whatsoever with the likes of Genesis or Yes. This Japanese band played a very unusual heavy concoction that fused a load of different influences into something often a bit closer to metal, which they saw fit to top with a bizarre female operatic singer. So untypical of prog then, it probably needs a style name all of its own!