Akatsuki & Ruka

This is the relationship between Akatsuki Kain and Ruka Souen. Although it has not been stated, it is quite clear that Akatsuki has feelings for Ruka. He asks her to dance with him during the ball while she turns him down, saying that she would not dance with anyone but Kaname Kuran. After Ruka realizes why Kaname holds feelings for Yuki Cross, her jealousy subsides. Ruka and Akatsuki are related in some way, as the two of them and Aidou are members of the “Aidou faction.” Akatsuki and Ruka have known each other since they were very young, and Akatsuki, when he was young, told Ruka everything, including that Aidou rebuffed Kaname. Akatsuki and Ruka are constantly together; he is the one who pulls her away from Kaname during the Ichiou incident, comforts her when she realizes how little she understands Kaname, and dances with her at the ball. The exact nature of their relationship is unknown, but Akatsuki is the only one person who Ruka is vulnerable around, abandoning her self-important, bored front.