The Demon Servant's Guardian Angel

For some reason, I keep dreaming of strange or horrifying scenes. Lately, I've been seeing all kinds of disasters in what feels like a split personality. Even harder to accept, I seem to have fallen in love with my best friend, though I know I'll never confess. All I want is for her to be happy.

Then one day, terrible news arrived. I couldn't believe someone as wonderful as her would take her own life and leave this world...

But after a certain person appeared, I gradually began to realize that humans aren't the only beings in this world: there are many other races, and I might not be an ordinary person either.

What? You want to be my servant, and there are more of you? Why?!

When Earth becomes a battlefield for gods and demons, angels, demons, and vampires all fight over me, even as they try to "kill" me. Which side should I choose?

No matter who I am now or who I was before, whatever the love or hatred between us, I'll follow my own heart, because he once told me that as long as I can master myself, I can master everything!