If you love Vampires, Lycans, Witches and many other monster's and royalties then this is your manga. Give it a try and see if it's your kinda of taste.
Sayarh is desperately trying to understand her past and the only clue she was left with was the secrets of a cube that was said to open Heavens Gate. Here she will find more than what she had bargained for.
Stick around and solve the mystery, will she be this world salvation or it's doom.