Isadora Collins. A demon who has looked after Yui since she was born. Watching over her until they met forming a friendship, but soon Isadora reveals the truth about her being a demon and forever loyal to Yui. In doing so, she accompanies the Sacrificial Bride to the Sakamaki Mansion, where more secrets lay hidden for both females, as the six vampires take them in, though they favour Yui more than Isadora. However, even though Isadora is intelligent, she cannot piece together the obvious clues that lay before her about her past and more of the contract she has with this bride.
Alice Komori is the adopted younger sister of Yui Komori. Alice is beautiful and very intelligent, but when someone ticks her off she can get quite rough. Alice despises her sister greatly. This is because of Yui's opinion in finding Alice's likes completely distasteful and because of the torment she put her through. Her love for the darkness and her love for the mere mention of death. All of which she is fond of is hated and despised by Yui and the people around her. When she is sent to the Sakamaki household with her detestable elder sister, will the six vampires living there fall for her and support her or will it be the opposite?