A defense system built on harvested human organs turns the people meant to protect Earth into its most efficient predators. The premise alone cuts deeper than most mecha shows bother to go. Three episodes of pure setup with no padding, no filler, no second chances to make you comfortable with what you're watching.
Earth's defense hinges on an automated network called ODE, a system designed to protect humanity from extraterrestrial invasion through swarms of unmanned combat units. The architecture sounds flawless until its terrible secret surfaces: the network requires a human being at its core, sustained by harvested organs to function. When these supposedly protective drones begin kidnapping civilians en masse, pilot Kyosuke and his squad receive orders to investigate and stop the abductions. What unfolds is a collision between mechanical efficiency and human cost. The anime questions whether a defense system built on such exploitation can ever truly protect those it claims to save. Characters confront the moral weight of survival when the machinery meant to safeguard civilization feeds on its own people. Tension builds as Kyosuke uncovers the system's true nature and must decide how far he'll go to shut it down. Claustrophobic and thought-provoking, this OVA combines robot combat with genuine philosophical unease. It appeals to viewers seeking mecha action grounded in real ethical stakes rather than simple good-versus-evil spectacle.