Rima Ogawa arrives as a transfer student from Mexico, joining a Japanese high school class. Her presence immediately triggers significant, inexplicable agitation in her classmate Masami. Rima possesses an ethereal, pale beauty that fascinates the male students, who deem her the most beautiful girl they have ever seen. This striking appearance fuels suspicion among others, suggesting potential supernatural danger like vampirism, especially as strange events plague Masami.

Masami experiences intense physical reactions to Rima, collapsing and requiring visits to the nurse, accompanied by a mysterious neck wound. These incidents coincide with Masami's nightmares and memory lapses. Rima becomes the focus of Masami's intense, confusing feelings. Video evidence later reveals Rima is the victim, not the perpetrator: a demonic entity possessing Masami emerges from her neck wound during sleep, specifically targeting Rima to feed on her blood and vitality, driven by Masami's repressed jealousy and desire to steal Rima's beauty.

Rima attempts self-defense using ritual incense against these demonic attacks, but this only angers the entity. Physical evidence, such as Rima's long black hair found in Masami's neck wound, initially points misleadingly to her guilt. The video footage, however, definitively proves Rima's innocence and victimhood. The demonic entity's repeated attacks culminate in Rima being devoured, resulting in her death.

Rima has no stated background beyond being a transfer student from Mexico. She exhibits no supernatural traits or motivations beyond her physical appearance and her unwitting role as the target of Masami's supernatural affliction. Her character primarily serves as the catalyst for the horror elements stemming from Masami's internal conflict and transformation.