Saito, a human character in Rozen Maiden: Zurückspulen, works part-time at the same bookstore as "Unwound Jun," the alternate-universe Jun Sakurada who never contracted with any Rozen Maiden doll. She has brown hair, brown eyes, and stands about 160 centimeters tall. Aspiring to be an actress, Saito joins a theater troupe outside her bookstore job. Recognizing Jun's talent, she recruits him to assist with costume design and sewing for an upcoming stage production, creating a significant point of connection.

Saito has an older brother, roughly 195 centimeters tall, also involved with the troupe. On one occasion, her brother mistakes Jun's purpose, directing him towards manual set construction labor instead of costume work. Through shared experiences at the bookstore and during the theater production, Saito appreciates Jun's sewing abilities and gradually forms a friendship with him, particularly following his unexpected encounter with the doll Shinku. Their interactions during the play's preparation facilitate Jun's social re-engagement and personal growth.