Rika Shiraki begins her story as the esteemed student council president of her academy, admired for her affluent upbringing and magnetic presence among male classmates. Her poised leadership and untouchable aura earn her the title of "school idol," though they isolate her from genuine connections. This fragile equilibrium shatters when classmate Taki Minase unearths a black magic tome and ensnares Rika with a love spell, stripping her free will. The enchantment forces obsessive devotion to Minase, driving her to obey his every demand—even coercing her into sexual encounters with strangers. The spiraling chaos culminates in a teacher’s death and Rika’s violent, spell-fueled retaliation against Minase.

Years later, Rika and former peer Kaori Saeki return to their alma mater as educators, only to be drawn into resurgent occult forces tied to the school’s shadowed past. While aiding efforts to quell the disturbances, Rika is ambushed by followers of antagonist Jody Crowley, enduring physical and sexual assault that mirrors her prior subjugation. The attack lays bare the unhealed wounds of her magical manipulation.

Rika’s youthful appearance during her student years features chest-length blonde hair and vivid green eyes. Her journey—from spellbound student to traumatized instructor—echoes the series’ themes of recurring exploitation and the insidious cycles of power and victimhood.