Kuranosuke Momiyama serves as the secretary to Haruka Misono, handling official duties and personal affairs for the Misono family. At home he also functions as Chiaya Misono’s caretaker. He is an adult man with black eyes and shoulder-length black hair, and he has a noticeably large, heavyset frame. Despite his imposing build, Momiyama possesses surprising physical ability, demonstrating agility and strength that defy expectations. His loyalty to Haruka is the driving force behind his actions. Initially, he is ordered to collect mysterious stones from various regions, but after an incident in Tokyo his mission expands to include locating Chiaya and bringing her home. Throughout the story, he secretly follows the traveling girls, shadowing their journey while remaining unseen. His most significant relationship is with Haruka as a trusted subordinate, and he has a protective connection to Chiaya as her caregiver. While his role is not overt, his quiet dedication and hidden movements influence the path of the main group.