The Cool Sister(Diabolik Lovers Fanfic)

What if Yui Komori isn't the only one who moves to the Sakamaki mansion and meet the bloodsucking Sakamaki brothers? Yui's sister is Ren Hattori who loves to cross dress as a boy and doesn't care what everybody thinks of her. But what Yui and Seiji didn't know is that Ren came from a family of demons where she is born half human and demon which is forbidden by the demons where humans and demons can't be together. That's when they demons killed her parents in front of her eyes, she is adopted by Seiji after her parents death since when she was little. Many years later, Seiji is now sending his two daughters to the Sakamakis due to his business trip from afar. However what did not know about is the Sakamaki brothers are bloodsucking sadistic vampires who goes after Yui's blood! How would Ren survived? How would Ren protect Yui from the Sakamaki brothers? Will she able to protect Yui from the vampiric Sakamaki brothers? Find out in the Diabolik Lovers fanfic!