The student council president. An outwardly cold girl, she is the most powerful student at the school. Her sister, Yuri, is the head of Reunion. Her initial impression of Gangryong is that he is useless. In the past, she fought Lightning Tiger, and the incident left a scar and a strong impression. Though he was her enemy, she regards him almost as a former lover. She fights using the Arts of Heaven's Rich Strength. What she seeks can't be obtained by Reunion or the council and she actually hold no interest in them. She fights Guesong after he interfered in her goal and kills him, afterward Rud challenges her to a formal match next year. But then she kills everu student in the school except Rud's company and few who escaped earlier. After that she makes Rud die in exchange of his friends' lifes.

Rena is Kanna's younger Sister and a potential Successor for the Head of the Oni-clan, if she can gain Setsuna's Heart.she talks only with her exchange diary and seem to have a no problem to argue with her sister, she fight with two katana (one white and black) which seem to have a purify effect against other oni and demon,and leave no harm to the posess victim,she works in a maid cafe.