Saitō attends Kibayashi-sensei's school as a third-year middle school student. He embodies a normal teenage boy, lacking prominent supernatural traits or eccentricities, especially when contrasted with classmates displaying distinct archetypes like delinquency or extreme poverty. As part of the supporting student cast, he interacts with the occult-focused teacher and occasionally participates in her supernatural incidents, including exorcisms and encounters with spirits or yokai.