The Bureau of Anomaly Control is the government agency in Hethereau responsible for managing Esper affairs and responding to anomaly events. Its primary duties include monitoring anomaly activity in the city (through the Worheimer Index), dispatching Espers to handle anomalies, researching anomalous phenomena and Oddities, and managing Esper registration and ability assessments.
The Bureau's most elite team is ETD-4, led by Baicang as captain, with members including Fadia, Lacrimosa, and Skia. ETD-4 handles the highest-level anomaly events and serves as the city's last line of defense. Baicang constructs defensive formations with the Power of Words, Fadia fights with the Transforming Cross-Shield, Lacrimosa coordinates multiple Constructs in battle, and Skia launches shadow attacks — this team operates with seamless coordination.
Beyond ETD-4, the Bureau has other teams such as CSU-2, as well as administrative and research departments. The Bureau maintains cooperative relationships with civilian organizations like the Eibon Antique Shop, outsourcing some anomaly commissions to the shop. There are also different factions and ideological divisions within the Bureau, adding more layers to the story's development.