Kiyoka Musumi is a 13-year-old second-year middle school student at Heijou Institute, born on August 30, with a height of 1.54 meters and blood type A. She comes from a noble and prestigious family that operates a kendo dojo. Despite her recognized talent in swordsmanship and a promising future in the field, Kiyoka possesses a mild-mannered and timid personality. She dislikes fighting and feels fearful about the Toji way of life, which requires actual combat experience. Due to family pressure, she pursues the path of a Toji even though she does not personally aspire to it.

Her hobbies include reading, particularly popular romance novels and magazines. She is known to become more engaged and light up when discussing her favorite topics. Kiyoka struggles with standing out from others. In the original video animation, she is depicted as an apprentice to Hiyori Juujou and participates in events alongside other Toji, such as Mihono Asakura. She is also part of a team that includes characters like Chie Setouchi and Kofuki Shichinosato in related storylines.

Her okatana is named Renge Fudou Teruhiro. Among fans, she is nicknamed "Rokkaku-chan," which originated from a fan-driven comic series. The name Kiyoka means "clear, pure, clean" and "fragrance," while her surname Musumi means "hexagonal." In other official depictions, such as a limited game event, she is featured in a police officer costume, though her character background remains consistent.