Simka Müller operates as an E=X communications monitor and personnel assignment coordinator within *Megazone 23 Part III*. She delivers a video message directing Eiji Takanaka to report to E=X headquarters for his new position. Later, Müller obtains photographic evidence showing Eiji and his friend Bud conducting unauthorized hacking after curfew. She confronts Eiji with this evidence, stating his actions could be interpreted as treason against the System maintained by E=X and that such violations typically result in termination of affiliation and rank revocation. However, acting on the directive of E=X Bureau Director Yacob Halm, who values Eiji's hacking skills, Müller does not enforce this penalty, allowing Eiji to retain his position. Subsequently, Müller assigns Eiji to pilot a Garland unit, an anti-netjacker transforming mecha. During a netjacker attack on the System Lab, she reports the situation to Director Halm and relays his orders deploying the Garland team. Her documented role and interactions occur solely within *Megazone 23 Part III*.