This one is an absolutely sinister output, without any glimpse of beauty or light. It reminds me on Gehenna in their "Adimiron Black" phase, end of the 90s. So, "Re Un" sounds somehow old-school or timeless, but definitely not out-dated!
I would call it pitch-black doom jazz, as the songs are mainly slow, but rather massive and intense. Often they appear hypnotic or even psychedelic, because of a lot of weird instrumental parts between ambient noises and grim fierceness.
Favorite track: III Conflict.