From the same anime project that is... the funny thing is.. both of them voiced vampires.. different series ofc... but still vampires none the less.

Soma Saito Ikemen Vampire.. (Vlad) and Shoya Chiba CARENALIAN BLOOD (TOXIN)

Damn do i fully love Soma's song in this though.. but on the other hand i like Shoya's equally in this project too...

(Im guesing it was Soma anyway.. i recognized the voice anyway.. i don't understand Japanese... so i don't for sure it was Soma..)

Also the funny thing is... they are both my favourite characters (the vampires) from each respectable series too.. XD

Edit: Yes the song is sung by Soma Saito for sure. (: i just checked whilst looking up perfection noise project. (: