In the technologically and magically advanced Wahrheit Empire, unsettling rumors about an enigmatic threat called the 'light' stir fear among the populace. In the capital, transporter Innumael Grauer struggles to support himself and his sister through his daily deliveries. When rookie soldier Leocadio Wöhler aids Innumael in transporting a suspicious package without realizing its illicit contents, Innumael finds himself accused of smuggling dangerous weapons. Facing the Empire's severe punishment, Innumael's only hope lies with the criminal organization behind the setup. Meanwhile, Leocadio embarks on his first mission to track down the notorious 'Headkeeper' group, linked to illegal arms trafficking. Magatsu Wahrheit: Zuerst traces the intertwining fates of these two individuals across the Empire, setting off a series of events that not only reshape their destinies but also the very fabric of the Empire itself.