The Battle of Van-Fleet Starzone continues with both sides locked in a stalemate. Gregor von Mückenberger, viewing the Grimmelshausen Fleet as a liability, has ordered it to reorganise itself at the second satellite of the fourth planet orbiting Van-Fleet, otherwise known as Van-Fleet 4-2, on 29 March 794 UC so as to keep it away from the front lines. Unbeknownst to Mückenberger however, the Alliance forces had built a rear support base on the same satellite before the battle commenced precisely because it is isolated from the front lines. When Reinhard von Müsel expresses his concerns over the possibility of an Alliance base on the satellite and proposes a reconnaissance mission to be conducted, Commodore Hermann von Luneberg, an expert in ground combat warfare, interjects, wanting to lead the mission himself. Meanwhile, the Alliance base commander dispatches the Rosen Ritter on a reconnaissance mission as well to determine the exact location of the Grimmelshausen Fleet.
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.
