In the land of Flonyard, there is the country of the Biscotti Republic, home to ordinary looking people except for their dog ears and tails. Their princess, Millhiore F. Biscotti, is busy preparing for another war with the cat-eared Galette Lion Territory and its ruler, Leonmichelli Galette des Rois.
To aid them in their battles, Millhiore summons a hero from another world: the ordinary middle school boy from Japan, Cinque Izumi! But while Cinque is a hero and comes to wield a sacred weapon, he comes to learn that the war between the two countries are carried out very differently than the ones on Earth! What adventures await the young boy in this strange land?