Rumina

Rumira is a first-year student currently attending Nangokuren High School. Rumina was a chairwoman of the Disciplinary Squad of Nangokuren High School, along with her twin sister Rurina. Rumina is shown to be serious and abides by the rules of Nangokuren High School. She is rumored to be super sadistic along with her sister, and has the will to attack anyone who breaks the rules. She is also loyal to Asuna, as she stopped attacking Rintaro, Tamao, and Kousuke because Asuna told her to. She's also willing to extort money for Asuna as well.