Saito is a second‑year supervisor assigned to the 3rd Division of the Shimamoto Labor Standards Inspection Office. He accompanies Eguchi on a construction site inspection as part of a mentoring policy. He is unfamiliar with wearing a waist belt and asks for instructions. He is eager to learn and brings a camera for records. During the inspection, he steps onto formwork covering an elevator shaft opening, and Eguchi pushes him to safety, which causes Eguchi’s fall. He is portrayed as earnest, inexperienced, and dependent on guidance.
