Tōma Kazamatsuri is a student at Kamizono Academy who prefers solitude, frequently seeking out quiet corners like the library or a garden bench. She has short, messy dark hair, wears glasses, and dislikes her morning bedhead. At home, she keeps a collection of plushies arranged on her bookshelf. A dedicated bookworm, she particularly dislikes physical education classes.

Her relationship with Torako Kageyama is complex; though often visibly annoyed by Torako's interruptions and maintaining a surface-level dislike, Tōma genuinely considers her a good friend and cares for her deeply. Their friendship began during a chance meeting at Kamizono Academy, where they promised to become mutual friends. The OVA suggests Tōma’s feelings for Torako may extend into romantic affection.

Tōma has an older sister, and their relationship involves frequent arguments. She also holds a specific connection to a hair elastic.