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A compilation film, recapping the Star Blazers: Space Battleship Yamato 2199 and Star Blazers: Space Battleship Yamato 2202 series.
These short stories fill in the background of Yang Wenli prior to the Overture to a New War movie, and continue with the background of Reinhard and Kircheis where Gaiden 1 left off. In these stories, Yang becomes the Hero of El Facile and is given a research investigation of some delicacy, Reinhard's first assignment to a ship at Iserlohn, Reinhard deals with a formal duel among the politics of the nobles, Reinhard's secret mission into Free Planet territory, and the Third Tiamat Battle, wherein Reinhard earns the rank of General at the age of 19.
Imperial Admiral Reinhard von Musell is an ambitious, aspiring young admiral within the Galactic Empire, who has earned the animosity of his peers; they believe that he has reached his position only due to his sister’s influence with Kaiser Goldenbaum, earning him the nickname of "the Admiral under the skirt." Meanwhile, Alliance Commodore Wen-Li Yang, fresh from his heroic victory against overwhelming odds at El Facil, has just been given the unenviable assignment of military advisor to a self-assured superior officer. Both of these Galactic Heroes, on opposite sides of the conflict, face the same task of having to overcome their superiors’ suspicions and win the day at "the 4th Tiamat Battle" of a 150-year-long war.
Having recently acquired the title of Count, Reinhard von Lohengramm is considered increasingly dangerous by the highest officials of the Galactic Empire. However, they cannot move directly against a man so favored of the Emperor, and he has proven his capacity in warfare. Thus, they intend to send him into a battle that they will ensure he cannot win. In the Free Planets Alliance, Wen-Li Yang's friend Jean Robert Lapp intends to propose marriage to their mutual acquaintance, Jessica Edwards. Wen-Li has only just returned home, but his respite will be all too brief: the Alliance soon hears of the intended Imperial invasion, and the man once more finds himself in a fleet headed for combat. The battle of Astate is about to commence...
Lafiel and Jinto are assigned to what they think is a routine diplomatic mission at a planet newly conquered by the Abh. But little do they know that the planet is no less than a penal colony for the galaxy's most ruthless and violent! When an all out war breaks out in the surface, the two are caught in the middle... and it may cost one of them their life!
Thousands of years later, humanity has advanced into space. Here it has divided into two countries with two different forms of government: the autocracy of the Galactic Empire, and the democracy of the Free Planets Alliance. These two countries have been at war for 150 years. Near the end of the 8th age of the space calendar, the appearance of two geniuses will change history forever. The unstoppable genius, Reinhard von Lohengramm, and the unbeatable magician, Yang Wen-li. As heads of the Imperial and Alliance armies respectively, the two will face each other in battle over and over again.