Shin Samurai-den Yaiba: Kaguya-hen

After overcoming the Dragon God's trial and obtaining the Dragon God Sword, Yaiba resumes his battle with Onimaru above the Pacific. Their duel is interrupted when an enormous vessel appears in the sky and Kaguya, ruler of the Moon, descends after awakening from a thousand-year sleep with plans to extend her rule to Earth.

Kaguya's strength is great enough that yesterday's rivals cannot simply ignore her, creating a three-sided conflict none of them expected. As lunar forces move to gather what their queen needs to survive, the contest over who is the greater swordsman expands into a battle for Earth itself.