Yui Komori is the gentle 17-year old girl who finds herself living in a mansion with six mysterious brothers who turn out to be vampires. Initially skeptical about her situation, she eventually comes to terms with it and faces her problems head-on. She struggles living with the Sakamaki brothers whilst fearing that one of them can just as easily attack her in her sleep. It was revealed later on that she carries with her the heart of Cordelia which would explain why the brothers are so drawn to Yui’s blood.