Three episodes, and Masami Obari spends every frame of them making armor look like it has opinions. This is the OVA where the hero shows up in Tomoru's head before he shows up in the sky, a bonding that plays less like a power-up and more like a haunting, and the Evoluders arrive as the answer to a question Orgun did not want asked. Zoalde is the reason it lands: an enemy who fights like he already knows how this ends and resents you for making him do it. Then Susumu Hirasawa's score comes in over the transformation work and the whole thing stops being 1991 mecha product and starts being a mood you carry around for years. Cel-era light blooming off shoulder plating, held a beat longer than it needs to be. And underneath all of it, a kid in a comfortable future city being handed somebody else's war.
An alien warrior arrives on Earth with no memory of who he is, only an urgent need to understand his own existence. When Orgun crash-lands in the city, he encounters Tomoru, a young man caught in the wrong place at the wrong time. Rather than destroy the witness to his presence, Orgun sees something in Tomoru worth protecting. The two form an unlikely partnership, bonded by circumstance and necessity. Their alliance faces immediate testing as the Evoluders descend on Earth with genocidal intent. These beings view entire worlds as obstacles to be erased, and they've set their sights on humanity next. Orgun possesses power beyond anything Earth's military can comprehend, yet his amnesia leaves him fighting blind against enemies from his own past. As battles escalate across the city, Orgun and Tomoru must discover whether their connection holds the key to stopping the Evoluders, or if Orgun's mysterious origins condemn Earth to destruction. This is hard sci-fi action wrapped in 90s OVA sensibilities: explosive, compact, and uninterested in long exposition. The tone balances desperate stakes with genuine camaraderie between two characters learning to trust each other under fire.