The Black Maiden

This story is about a 14 years old girl named Rachel dela Victoria. And she is the younger sister of Lea dela Victoria. Both live in a mansion and do home school. But these two aren't just ordinary people but Lea's sister is actually a demon and was once a science experiment due to her rare butterfly wings. And now, the scientists that once tried to dissect Rachel are murdering people for what reason? Are they trying to lure her out to dissect her again? Or is it something else? Read this and find out!