Seras, a young woman in college, was kidnapped and tortured. An unlikely being saved her life, right before taking her own life. The only thing she could remember when her head was ripped off her body was the word 'Descendant'. The demonic figure had mentioned that to her. Follow the story of Seras, now known as Yui Bloodvich, as she takes her place in a new world. Yui is now forced to play the role of the descendant and vessel of death itself.