"The Super Dimension Century Orguss: Memorial" is a two-episode OVA series that serves as a condensed retelling of the original 1983 anime "The Super Dimension Century Orguss." Set in a future where Earth has been devastated by a cataclysmic war, the story explores themes of survival, identity, and the consequences of advanced technology. The narrative centers on Kei Katsuragi, a skilled pilot who becomes entangled in a conflict that spans multiple dimensions and timelines.

The series begins with Kei piloting a prototype mecha during a test flight when an experimental weapon, the Decimator, is accidentally activated. This event triggers a dimensional collapse, merging fragments of different timelines and realities into a chaotic, unstable world known as the "Super Dimension." Kei is thrust into this fractured reality, where he encounters diverse factions vying for control over the remnants of Earth and its resources. Among these groups are the militaristic Emaan, the technologically advanced Zafran, and the mysterious Mu, each with their own agendas and ideologies.

Kei's journey becomes intertwined with that of Mimsy, a young woman from the Mu civilization who possesses a unique connection to the Decimator. As Kei and Mimsy navigate the war-torn landscape, they uncover the truth behind the dimensional collapse and the weapon's origins. The Decimator, designed to end wars by erasing entire timelines, becomes a focal point of the conflict, with various factions seeking to harness its power for their own purposes.

Throughout the series, Kei grapples with his role in the unfolding crisis, questioning whether his actions can restore balance or if they will further destabilize the already fragile world. The narrative delves into the moral complexities of war, the ethics of technological advancement, and the resilience of humanity in the face of existential threats. Supporting characters, such as the enigmatic pilot Olson and the determined Emaan officer Shaya, add depth to the story, each contributing to the broader exploration of loyalty, sacrifice, and the search for identity in a fractured reality.

"The Super Dimension Century Orguss: Memorial" condenses the original series' expansive narrative into a streamlined format, focusing on key plot points and character arcs. While it retains the core themes and conflicts of the original, the OVA emphasizes the high-stakes action and emotional weight of Kei's journey, offering a concise yet impactful retelling of the story. The series concludes with a resolution that underscores the cyclical nature of conflict and the enduring hope for reconciliation in a world forever changed by the consequences of human ambition.