Sanae is kidnapped by Takeru, a warrior from the rival kingdom of Akusa, and placed at the mercy of the evil witch Yomihime. Izumo, helped by an orphaned glider pilot named Navi, must now take up the sacred sword of his country, master its powers, and rescue Sanae. However, before that, he must defeat the reawakened eight-headed snake of legend, Yamata-no-Orochi.