Five years have passed since the end of the imperial civil war and the death of Zorzal and Tyuule. In the special region, Pina now reigns as an empress and acts as best she can in order to increase the peaceful relations between the new reborn empire and Japan. Itami Yoji returned to Tokyo for a while, accompanied by his inseparable friends: Lelei, Tuka and Rory, who received special authorization to stay with him in Japan. But while Itami and his team were soon to be sent back to Alnus, an unforeseen event occurred: a meteor rain fell on Japan, quickly revealing the arrival of mysterious invaders from space and determined to seize the earth by force. For Itami and his team, the most difficult fight of their lives begins, and the outcome of which could determine the fate of all humanity.