Айдзава Аюму

A computer expert who helps Yuuka and Miyuki re-open the Union School's Circlet Bout club as the manager. She often wears an oversized white coat that used to belong to her father, who is one of the developers of Circlet Bout and the technology around it. She has no interest in it until her father's disappearance.

During Circlet Bout, she is tasked to analyze the opponent's capability and coming up with strategies that give her team the advantage. She doesn't actually compete in any bouts but still possesses her own weapon: a riot shield. Unlike the rest of her team, who can take both an offensive and defensive fighting stance, she is heavily defensive. While she relies on the arsenal of weapons that she installed in her shield, that doesn't do her any good since she lacks the training to dodge any coming attacks.