Plot
At the Daitou Mine, the mysterious swordsman Shirou Inukai is attacking Kojiro and Tsugumi. Inukai has a single objective: "to steal katanas." Musashi has come running back after escaping the trap he fell into, but the three of them seem helpless against Inukai's strange power...However, the obsidian power slumbering within Musashi has awakened, and the Kanemaki Band's counterattack starts now!