A theatrical adaptation of the popular manga by Michiaki Watanabe. This is the story of Hamel and his companions, who fight against demonic monsters using musical instruments as weapons. Continuing their journey toward the northern capital, Hamel and his group visit a small kingdom that has suffered a cowardly attack by the demons. There, Hamel meets the king and queen, who are overwhelmed with grief—their daughter, Princess Bellira, has been kidnapped by the demons. Tasked with rescuing the princess, Hamel infiltrates the enemy’s castle alongside his comrades and confronts the boss, Medusa.