Yuri

Nanno's rival. In episode four, Yuri was originally a victim Nanno attempted to help after she was mistreated by two rich girls who blackmailed students, including Yuri, with with sex tapes of the students being raped. However, it is revealed that Yuri had already planned for revenge on the girls since her assault. Yuri's plan backfires when the men she hired to assault the girls kill Yuri as well, drowning her in the tub that a bleeding Nanno was placed in. Nanno's blood revived Yuri, which gave her the same powers and immortality as her. However, unlike Nanno, Yuri prefers revenge by killing her victims or causing chaos instead of teaching them a lesson. Yuri appears to be very manipulative and seems to have no remorse for any of her actions. Similarly to Nanno, Yuri's outfit is a traditional female school uniform, with her hair tied in a ponytail using a signature red ribbon.

(Source: Wikipedia)