You want heavy? You need to give the band, Boris a try.
Since we're talking about 'heavy' bands...what makes a band 'heavy' in your perspective? Whats your definition of it.
Boris is AMAZING. <3
At any rate , most VK bands attempt to be metal , it's rare to see a actual metal vk band. Not that cheap cop out metal where they have like one or two songs a release that are somewhat metal. Such as Girugumesh and most of these popular bands who are 50/50 pop ballads thrown in , not even real ballads.
X-Japan is hard rock , they were good , but had a slight pop edge to some of thier songs. Kinda like most 80's rock bands. Anthem , SMG , and Loudness rock out and out. A metal band for me is being heavy , mostly heavy , I tend to like death metal more because of the constant guitar work and most death metal guitarists are amazing.
Alot of stuff is deemed metal , that isn't. such as girugumesh , alice9 , ayabie , nightmare , wizard , most vk bands never reach a metal level. Most actual metal bands are not widely known either.
What makes metal for me , is constantly heavy , deep vocals , guitar and drum solos that last more than a min , and the absence of poppy songs in thier disco.
Off-note , it reminds me of how Blue Oyster Cult and Deep Purple were considered Metal a couple of years back.
I also forgot to add Volcano to that list. Volcano is amazing.