After resisting a magical attempt to erase his memories, Musashi is imprisoned in the Dragon King's castle, where he finds Nami also held captive. To secure their freedom, Musashi accepts a challenge from the Dragon Master, eventually leading to a political arrangement where he is named chief and married to the daughters of the tribal leaders. Now the husband of multiple wives, Musashi prepares to return to high school while struggling to keep up with the demands of his new harem.