Tomono Kojō, attendance number 6 in Class 1-3 at Roubai Girls' Academy, bears a surname meaning "old castle, old fortress" and a given name signifying "wisdom, intellect" and "from". She moves quietly through school life, known for her gentle demeanor and constant companionship with books, easily identified by her glasses, auburn hair, and brown eyes.

Her journey began in Nagano Prefecture, where a passion for literature took root early. Winning first place in her elementary school's 34th literary competition cemented her dream of becoming an author. Her mother celebrated this achievement with a handmade bookmark featuring pressed flowers, an object Tomono deeply treasures as both a cherished memento and a good luck charm.

Naturally, she joined Roubai's literature club. Her friendship with Komichi Akebi sparked when she borrowed Komichi's handkerchief. Though reserved, Tomono occasionally steps beyond her comfort zone, like assisting the drama club by writing scripts, though creative blocks sometimes stall her progress during these tasks.

A less obvious facet is her training in naginata-jutsu. The loss of her precious bookmark caused significant distress, leading to a collaborative effort by her classmates to recover it, underscoring her profound emotional attachment to this symbol connecting her to family and aspiration.