Any1 Know this song ?????

[Aquarius]

Hey guys, I want to know that what is the real name of this song although it says that it is Hidan theme song but i don't think so any 1 know of it :-

[VIDEO=youtube;1-K4c-ueWuc]www.youtube.com/watch?v=1-K4c-ueWuc[/VIDEO]​