Myoue serves as one of three guardians protecting Kyoto's hidden mirror capital, a sanctuary where humans and youkai coexist without death. Alongside Kurama and Yase, their duty involves maintaining stability in the city while awaiting the return of their parents, Myoue Jonin and Koto. The long-standing peace upheld under this guardianship faces disruption when a young girl named Koto and her brothers arrive from another dimension, initiating significant changes. Myoue's background and central motivations are deeply shaped by the absence of these parental figures, directly influencing actions and responsibilities within the mirror capital.