Diabolic lovers Yui's little sister

Alice Komori, Yui's loving little 15 year old sister. They were both taken in by Seiji when they were infants, and grew up together. Growing up together they were inseparable,and grew very protective of one another especially Yui, not letting anyone lay a hand on her little sister. so when Seiji decides Yui will be going to live with someone else it obviously affected them both. They loved each other and cherished each other more than anything.
What happens to Alice when Yui leaves? What will the sisters do when Seiji comes back making Alice go as well? What happens when Alice finds out Yui is living with Vampires? And what if she develops weird feeling for them either good or bad?
Read to figure out the answers to these questions and the story, of Diabolic love.

I do not own the characters to this series, only a few of my own. I hope you enjoy my story and this is the first fanfic I've written so sorry if I get some things wrong.