After regaining consciousness, high schooler Asagaya Makato has become an AI for a space battleship. As if that wasn’t enough, the ship has been surrounded by enemies, and he himself has a damaged engine, putting him in a dire situation.The warship commander had already died in combat, and taking the place of temporary commander is a young girl of the imperial family, who had joined the ship out of courtesy. Makato had tried convincing himself that this was a dream, but being persuaded by the girl, he stands as a battleship.