Located within Hethereau, the Eibon Antique Shop appears to be an ordinary store dealing in antiques and curiosities, but it secretly serves as the operational headquarters for the Appraiser. Shop owner Hotori manages day-to-day operations and coordination, providing mission guidance and logistical support. The shop's shelves are lined with all manner of antiques and anomalous objects, each potentially holding an unusual story.
The shop is home to several Esper companions, each with distinct personalities and roles: Nanally, a close-quarters combat specialist; Sakiri, who fights alongside her symbiotic partner Kiroumaru; the reliable Adler; and the uniquely eccentric Edgar and Taygedo. They each shoulder different responsibilities and provide backup when the Appraiser ventures out on assignments.
Beyond its functional role as a base, the Eibon Antique Shop is also an important space for character interaction and bonding. Here, players can converse with companions to learn about their backstories, accept new commission requests, and organize equipment and resources. For the Appraiser, the antique shop is both the starting point of every adventure and a warm haven to return to.