UnEnding Bloody Call

The town of Grazheim is where humans and nonhumans called Hanki coexist — visibly, at least. Beneath ordinary daily life, a silent war between the two groups has been running for years. Futaba is entirely normal, completely unaware that her father is the head of an organization called Fly Call that sits at the center of all of it. She comes home from school one day to find the house ransacked and her mother gone. She is about to be kidnapped when two beautiful twins — Reimei and Shirou — appear to rescue her. They were her father's bodyguards; he died years ago (though Futaba was told it was a traffic accident), and his last request was for them to protect her. Reimei tells her she must become the next head of Fly Call. She refuses. But to get her mother back, she moves into her father's mansion and begins to learn what her family actually was.