The Appraiser is the character played by the player in YiHuan. As a Cosmos-attribute Esper, the Appraiser possesses an extremely rare ability — the power to sense and analyze the essence of anomalous objects, Oddities, and anomalies. This appraisal ability is exceptionally rare in the world of YiHuan, making the Appraiser a highly sought-after recruit by both the Bureau of Anomaly Control and the Eibon Antique Shop.
The Appraiser was discovered and recruited by Hotori, the owner of the Eibon Antique Shop, becoming a member of the shop. In their work at the antique shop, the Appraiser is responsible for appraising and analyzing items and phenomena from various anomalous commissions, providing critical intelligence for the combat teams. The Appraiser's appraisal abilities continue to evolve as the story progresses, gradually enabling them to interpret deeper layers of information.
The Appraiser's existence is crucial to the entire story — it is through the appraisal ability that the origins of anomalies, the true purpose of The Circle organization, and the deeper secrets behind Esper awakening are gradually uncovered. The Appraiser's abilities also continue to grow, from initially being able to sense only surface-level anomalous information to eventually being able to directly read the core structure of anomalies.