Feature-length spin-off from the anime adventure series. When Eureka is kidnapped, her childhood friend Renton vows to rescue her. He enters the military and is soon assigned to the Independent Youths Unit 303 of the First Mobile Forces owing to his exceptional performance. But unbeknownst to Renton, he has inadvertently become part of a plot to extinguish an imminent alien invasion - a plot that involves not only him, but Eureka too.