The Secret Princess ; Rine Everleigh

Rine is an ordinary kid, right? Yes, she is an ordinary child who is smart and diligent! However, she was being bullied, so something was told. After doing that, Rine's life changes drastically, however, it helps her to find out the mystery about the old man and the news that suddenly disappeared without a trace. Rine also experienced things beyond human reason, she tried to do it, but couldn't. A good angel also turns into an evil demon because of her behavior. Wait, Rine's father is amnesic !? Wa .. wait ... my father is .. KING !? No, no, it doesn't matter, if the fighting demons keep growing and dominating the world, the world will end, right? Is there any way to monitor the devil before, the angel? How come it takes magic and various kinds to change that? However ... why did the people Rine loved disappear one by one? Is this a curse? Bad luck? Of course not.