Reinhard von Müsel and Siegfried Kircheis attend Karl von Reifeisen's funeral. Reinhard notes that Moritz von Haase's eulogy for Reifeisen is formal, but lacking in emotion. After offering condolences to Reifeisen's family, Reinhard confides with Kircheis on his views about the Imperial populace that has been repressed for over four centuries. At night, Reinhard receives news that his father Sebastian von Müsel has passed away. The next day, he attends the funeral of his father with Kircheis and meets up with his sister Annerose von Grünewald briefly. Upon their return to their alma mater, they are informed that another murder has occurred in the school; the victim being one of the top students of the school. After viewing the murder scene, Kircheis begins to suspect that Haase is colour-blind and that he might have committed the murders to conceal evidence of his defect.
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.
