You're the youngest of Karlheinz's children, your older brothers are: Shu, Reiji, Ayato, Kanato, Laito, and Subaru. All are very different from another, not only physically, but emotionally.

You walk downstairs like every other day except something is different this time...there's a new person, a girl, a human who looks rather out of place and nervous. Named Yui Komori, your brothers new "bride" Although to you and your older brothers, she's nothing more than a sacrifice, a blood sacrifice.