She meets Kikunosuke Abashiri in her room/cell in OVA 2 and is a little surprized that she is female since Kiku-san talks like a man. She thinks Kikunosuke is suited to the school at first since she seems tough or something and is freaked out by the sounds of her classmates being murdered dring the night. When an emergency meeting is held, she trys to wake up Kikunosuke but goes to the meeting anyway and is almost beat up or has...Blue things doen to her by Chidoro. Then Kikunosuke shown up and beats up Chidoro despite Yukiko's warning of not going against the teachers or she may be wacked. In OVA 3, when Kikunosuke has to go to the inner reflaction room she begs Kikunosuke not to go but Kikunosuke says they won't be a problem. After Kikunosuke gets bwned in the inner reflection room, she treats Kikunosuke's wounds with cool water and kisses her to purify her lips after Kikunosuke was...tounged by a big guy. She says she feels relieved that Kikunosuke is acting like a normal girl about her first kiss and how the first kiss is important to a girl. While getting water, she is kidnapped by a teacher and Biniku fakes being her. The real Yukiko is being held in a dungeon in her undies by the teachers and is almost...male organed for having bad grades, when a teacher comes in and reveals Kikunosuke's true name(since everone thought she was Shiratori Reiko). In OVA 4 she is chained by her arms in a tower or something and Goemon Abashiri comes in. He feels her hips and takes off her bra but she just wants him to help Kikunosuke (and screams when her bra is pulled off in Criss Angel fashion). Later, she is being held hostage with Goemon by the leader of the students and trys to get out of her leather S/M bondage while Kikunosuke is getting her clothr taken off by 7 guys(7 guys?! its like Nami S.O.S. all over again!). She finally breaks out and runs to Kikunosuke but gets her brains blown out by the leader with a gun. And then...She died. Don't worry, Kikunosuke Abashiri kills him Gento Kou Ken Style!