Asagaya Shin, an ordinary high school student who was supposed to be in Mitaka, Tokyo just a few days ago, somehow found himself as an AI of a space battleship. The battleship is surrounded by a large enemy fleet, and with only a few consort ships left, it is in a desperate situation. Moreover, the captain of the battleship is a young girl, a decorated member of the royal family, who was ceremoniously on board. Shin, now an AI, takes advantage of his "human" characteristics and attempts to fight a withdrawal battle using novel tactics to survive...