Guardian Angel of Demon Servant

I don't know why I always dream of some strange or tragic scenes, and recently I have seen many disaster scenes in detail. What I can't accept even more is that I seem to have fallen in love with my best friend, and I know that I will never express this love. I just want her to be happy. Suddenly one day bad news came. I didn't believe that such a beautiful woman would commit suicide and leave this world... And the appearance of someone made me gradually feel that in addition to humans, there are many alien races in this world, and I seemed to be no ordinary person. What? There is more than one person who wants to be my servant... Why! When the earth became a battlefield between gods and demons, angels, demons, vampires... I became the object of their struggle and the person they wanted to "kill". Which side should I choose to stand on? No matter who I am now or who I used to be, whether I have grudges, love or hate, I only follow my heart - because he said that as long as I can dominate myself, I can dominate everything!