Mikage and Mamiya figure that they can make use of the Student Council members to make duelists strong enough to defeat Utena. They say they were defeated just because they couldn't control their minds, not because of their skills. They say if they arrange someone whose mind they can control and make him/her draw the sword and skill from a student council member, then maybe it is possible to make a duelist and have him/her defeat Utena by mind-controlling.
Miki's twin sister, Kozue, deliberately does things Miki doesn't want her doing (such as making boyfriends Miki wouldn't like), because when Miki's mind hurts about her, she feels she has filled Miki with herself. Besides, Kozue doesn't want Miki getting along with anybody. She says she won't forgive anybody who tries to get too friendly with him. She even has pushed a (gay) music teacher off a cliff. She knows Miki likes Anthy. One day, Miki asks Anthy to play the piano with him. Kozue is very jealous against Anthy. Kozue feels Miki's concern is getting away from her farther and farther. She consults at Nemuro Memorial Hall. Taking advantage of that, Mikage makes her a Black Rose Duelist.
Miki semble être tombé amoureux de la belle Himemiya dont les talents de pianiste ne le laissent pas indifférent. Cette affection portée à la Fiancée de la Rose contrarie fortement Kozue, sa sœur jumelle, qui se sent complètement délaissée par son frère. Désemparée, elle se laissera tenter par les charmes de la Rose Noire.
双子の兄である薫幹に対して屈折した愛情を抱いている薫梢は、幹に近づく者を力づくで排除する。彼女のその思いを利用しようと、黒薔薇会の魔の手が梢に迫っていた。そして、ある決闘が行われることとなる。
對雙胞胎哥哥懷抱著曲折情感的薰梢來說，凡是接近哥哥的人都等於在玷污哥哥、都是不可以原諒的人。她不斷排除任何接近她哥哥的人。但是關心安希的小幹，卻漸漸疏遠了小梢…黑薔薇會的御影草時就是利用小梢這種心情，使她成為了決鬥者。戴上黑薔薇刻印的梢，從哥哥的胸中拔出了「心之劍」，用這把劍和歐蒂娜決鬥，為了奪取身為薔薇新娘的安希的性命，也為了讓世界革命。
