The pushy leader of the student council. Marii is nearsighted, but refuses to wear her glasses in public for fear of ruining her image. Known at school as the "Iron Woman", she hates the Camera Club, mostly R and Tosaka, and is often accompianied by her makeshift assistant Iwashimizu. Her family owns a stamp tour agency, something that comes into play during the OVA. She loves volleyball and getting adoration from the student body. Her design was based on Maria Kawamura, whom is also her voice actress.