Noriko was a student of U.A. High School, a school for superheroes, when Niki, a Monika variant, invaded the school and recruited some of the students to become villains. Noriko had accepted this as her new life and became a villain under Niki. During her training, however, her head was badly injured, requiring her to have a mechanism implanted into her skull to keep her alive. This boosted her powers and cut off her emotions, making her a perfect villain.