Hermann von Luneberg pays a visit with his wife Elizabeth to High Admiral Ovlesser, the commander of the Imperial Panzergrenadiers, ostensibly as a formality marking his promotion to Rear Admiral but is in fact trying to lobby for support against Reinhard von Müsel from the high nobles through Ovlesser. Ovlesser, who dislikes Luneberg as much as Reinhard, rebuffs his overtures. Meanwhile, Siegfried Kircheis tells Reinhard about the results of his investigation of Luneberg's background. A few days later, they manage to meet up with Annerose von Grünewald and Reinhard reveals to Annerose about how Kircheis was not promoted. Before Annerose could do anything about that issue however, Admiral Grimmelshausen has already recommended Kircheis to be promoted. When Kircheis visits Grimmelshausen to thank him for his recommendation, he demonstrates a level of insight which runs contrary to his usual appearance as a senile old man.
Prequel to the original series, focusing on Reinhard and his steps up the chain of command in the Galactic Empire. Also focusing on the FPA's Yang Wen-li. A chronicle on how he earned the title "The Hero of El Facile" and his handling of assignments he received after the historic event. Spiral Labyrinth also continues with the background of Reinhard and Kircheis where the first Gaiden left off.
