Kiyone Amayuri teaches at Umi no Hoshi Elementary School alongside Mihoshi Mizutani and Washu Kobayashi. She enforces school rules with a rigid, no-nonsense approach, frequently chiding students and colleagues for protocol violations, even in unconventional situations outside school. Her background includes an arranged engagement to the wealthy, outwardly charming Andou Toyokawa, intended to secure her family's financial stability. This engagement ended abruptly when Pixy Misa publicly exposed Toyokawa as a deceitful womanizer during a school festival event, compelling Kiyone to cancel the marriage. While her professional life centers on discipline and order, the fallout from her failed engagement marks a significant personal development. Her interactions primarily involve reacting to the comedic chaos caused by others while maintaining her stern disposition.