Hah, I wouldn't call it black metal since it doesn't have its trademark sonic qualities or "ideology", but yeah, in the few interviews he did he said he was inspired by anime cinema, as in this album he pays tribute to "Ghost in the shell" as one of its song titles, and "Mononoke" in his previous album.
Here is something interesting, so I clicked that MetalIreland link above and found their review for Vanitas: MetalIreland's Review for Anaal Nathrakh's Vanitas
I don't necessarily agree with the review (that's fine, we all have our opinions) but IT CLEAR AS DAY that he noticed how horrible the drums sound. That's the DR2/3 master.
Woot first post. Will be checking out this thread in the next few days. Was planning on using a different username but when it was taken I decided to try the title of the song I was currently listing to and it went through. It seems only fitting I add it here. Rock on gentlemen and the ladies