Musashi returns to his childhood village after fifteen years, where he is greeted by a seductive childhood friend named Tamamo. However, as he becomes entangled in a passionate reunion, he discovers that the village is a deceptive imitation and Tamamo is actually an Enra monster attempting to manipulate him. With the help of his true companions, Musashi breaks the illusion, regains his memories, and prepares to confront the Enra Fire village chiefs to stop their schemes.
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.