Kuina Sazanami is an Oni and student of Rasetsu Academy. Kuina is a fair-skinned young woman with short, light brown hair (blonde in the anime) and matching brown eyes. She's of above-average height with an hourglass figure, thick thighs, and noticeably huge breasts. During her introduction, Kuina appears to be a relaxed yet rebellious girl who doesn’t care what other people think and just does whatever she wants. However, during the student's first mission, her true nature is revealed to be that of an extremely obsessive person who desperately wishes to protect others, especially weak men like Rokuro Kiriyama. This borderline insane mentality has earned her the nickname of "The Obsessively Devoted Woman". An example of how dangerously intense this form of "affection" can be, Kuina will force a man to stay at home and do nothing except have sex while she takes on all of the work. She is also willing to kill anybody who might steal her partner's attention, regardless of the individual's gender, sexuality or intention, such as when she thought about killing Ikari when Rokuro complimented his Blood Eclipse Release.