Mythical Japanese hero Momotaro banished the ogres from their island home. Now their modern descendant Kokonose Mutsu is determined to reclaim his family's birthright! Armed only with his dubious exorcist powers, his adorable face, and his enormous ego, the precocious pipsqueak sets out to reconquer the island which has been turned into a military school for demon exterminators. These hardened soldiers are well prepared for any onslaught but can they stop laughing at this ludicrous invader quickly enough to put up a fight?