Currently, the 'Babylon Tower' has been renamed to the 'Xumerian Empire' following the end of the war, so that people from other cities understand that it is no longer just a city but an empire. The city itself has been equipped with various security systems, each serving different purposes: from systems that remove damaged blocks to protect the majority of the city, to firewall walls to defend against intruders. Lastly, the city's security system includes a Class 1 mechanical giant named "Gilgamesh," responsible for overseeing the entire system.

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           The security systems of the Xumerian Empire are tasked not only with preventing external intrusions but also with preventing internal exits. It is considered to have the strictest regulations in the world. Therefore, it's not surprising that there are people who oppose these systems. However, it is not easy to rebel against the mechanical systems of this empire.