Riko manages the daily operations of the Dai-Rin House, a residence affiliated with the nearby Sekku Temple. This house served as the childhood home for both Ouri Kagami and Keisei Tagami, who grew up there under Keisei's guardianship. Her association with the Dai-Rin House commenced when Keisei received his assignment to Sekku Temple. At that time, both the temple and the house were severely dilapidated. Riko, her mother, and Keisei collaborated extensively to restore both structures to habitable condition. This shared restoration effort established her enduring role in managing the facility.