Legend of the Galactic Heroes Gaiden

In July 791 UC, Reinhard von Müsel and Siegfried Kircheis, upon graduation from a military preparatory school, is posted to the planet Kapche-Lanka as their first assignment. Unbeknownst to them, Sussanna von Beenemünde, who harbours jealousy and hatred towards Reinhard's sister Annerose von Grünewald, is secretly plotting to kill him by bribing Reinhard's new superior, the base commandant of an Imperial base in Kapche-Lanka, to do so.

As a plot to kill both of them, Reinhard von Müsel and Siegfried Kircheis are dispatched by their superior to reconnoitre deep into the planet Kapche-Lanka for Free Planets Alliance activity all by themselves. Before their departure, Reinhard and Kircheis' tank is tampered with to ensure that they will not have enough fuel to make it back to base. It is nightfall before both of them realise that act and they are forced to halt and figure a way to get back to base alive. By chance, they encounter an Alliance tank advance unit and decides to ambush it for securing fuel.

Reinhard von Müsel and Siegfried Kircheis successfully ambush a Free Planets Alliance tank advance unit and secure not only fuel, but also information about an upcoming Alliance surprise attack on their base. Suspecting that their base commandant Captain Herder was responsible for their predicament, they decide to wait for any of his accomplices to appear. Eventually, Lieutenant Hugenberch finds them and after he shows hostile intent, Reinhard kills him. They then return to their base and finds the surprise attack already started. Kircheis manages to disable the attacking Alliance tanks by transmitting to them a code he wrote based on stolen data from the tanks he and Reinhard previously ambushed, enabling the Imperial forces at their base to successfully counter-attack and end the Alliance surprise attack.

Reinhard von Müsel, feigning ignorance of Captain Herder's plot to kill him, tries to convince him to attack the Free Planets Alliance base on Kapche-Lanka. Herder accepts Reinhard's suggestion, thinking it as another opportunity to kill him. As the attack plan proceeds, Herder orders Reinhard and Siegfried Kircheis on a separate assignment to isolate them. He then attempts to ambush Reinhard, but is foiled when Kircheis brings the base second in command, Commander Martel, to witness Herder's act. With his crime exposed and fearing the punishment for high treason, Herder commits suicide by leaping off a valley. Although Reinhard and Kircheis are unable to expose Sussanna von Beenemünde as the mastermind for plotting their demise, they are promoted for their contributions in the successful attack on the Alliance base and are soon transferred out of Kapche-Lanka.

In April 793 UC, Reinhard von Müsel and Siegfried Kircheis, while waiting for their next assignment, visits their alma mater in Odin. They are warmly welcomed by the students there, who respect them greatly. After observing the school for a day, Reinhard and Kircheis finally receive their new assignments in the Imperial Military Police. The next day, while browsing through the archives in the Military Police headquarters, Reinhard discovers a case handled by Ulrich Kesler during his tenure as a military police and is impressed by his unorthodox method of protecting ordinary civilians from the oppression of the Military Police. However, when he finds out that Kesler's efforts were ultimately futile, he breaks out into a rant about the degenerate state of the Galactic Empire that is only cut short by new orders from the Chief of Military Police. He and Kircheis are ordered to return to their alma mater to investigate the apparent murder of Karl von Reifeisen, a student who died the night before.

Reinhard von Müsel and Siegfried Kircheis take up lodgings in the dormitory of their alma mater for the duration of their investigation of the death of Karl von Reifeisen. During their first night, Reinhard dreams about past events of his life. The next day, Reinhard and Kircheis begin their investigation, first by examining the murder scene and then looking up on the school records of the deceased before ending with an interview with Moritz von Haase, a student sent by the school principal to assist their investigation, about the conduct and personality of the deceased for possible clues that caused his demise. Overall however, their entire day of investigation ended with no headway towards solving the case.