Mikado's ex-girlfriend, transfers to their school to be with Mikado. Also psychic, she can bend spoons and sense card types, though her powers can go out of control if she doesn't concentrate. Though she knows he only dated her because she was his test subject, she is initially jealous of his affections toward Ion. Eventually she realizes she doesn't really like him and befriends Ion after Ion saves her from harm during another experiment.
Her name is based on Arina Tanmura's friend and mangaka colleague Ai Minase