"Armored Trooper Votoms: The Last Red Shoulder" is a four-episode OVA series that serves as a prequel to the original "Armored Trooper Votoms" anime. Set during the Hundred Years' War between the Gilgamesh and Balarant factions, the story centers on the exploits of the Red Shoulder Battalion, an elite and infamous unit within the Gilgamesh military. The narrative focuses on Chirico Cuvie, a young soldier who later becomes the protagonist of the main series, and his experiences within this ruthless and highly skilled group.

The Red Shoulder Battalion, led by the cunning and manipulative Colonel Rochina, is tasked with executing high-risk missions that often involve morally questionable tactics. Chirico, initially a new recruit, quickly demonstrates exceptional combat skills and adaptability, earning a place within the unit. However, as the story progresses, Chirico begins to question the ethics of the battalion's methods and the true motives behind their missions. The unit's reputation for brutality and its willingness to sacrifice its own members for strategic gains create a tense and morally ambiguous atmosphere.

The plot delves into the internal dynamics of the Red Shoulder Battalion, highlighting the camaraderie and rivalry among its members. Chirico's interactions with fellow soldiers, such as the seasoned veteran Ypsilon and the idealistic rookie Gotho, reveal the psychological toll of warfare and the dehumanizing effects of being part of such a unit. The OVA also explores the political machinations within the Gilgamesh military, as Rochina manipulates events to further his own agenda, often at the expense of his subordinates.

A key mission involves the Red Shoulder Battalion being sent to infiltrate and destroy a Balarant stronghold. This operation serves as a turning point for Chirico, as he witnesses the full extent of the battalion's ruthlessness and the personal cost of their actions. The mission's aftermath leaves Chirico disillusioned and sets the stage for his eventual desertion, which is a pivotal event in the main series.

"The Last Red Shoulder" provides crucial backstory for Chirico's character, shedding light on his origins and the experiences that shape his worldview. It also offers insight into the broader context of the Hundred Years' War and the morally complex nature of the conflict. The OVA maintains a focus on military strategy, personal struggle, and the consequences of war, staying true to the themes of the original series while expanding on its lore.