Hikaru, Sadamitsu and Tsuna climb the slope of Oeyama, where the besieging Shuten Doji's army has its main encampment. Looking down, the city below them appears devoured by the flames of a raging inferno, caused by the overwhelming power of the incredible weaponry of Kumaso. How can Hikaru and her followers save Heian and themselves from the approaching catastrophe?
酒呑童子の持つ最後の勾玉を取り戻すために、急ぎ大枝山へと向かう光たち。
しかし熊襲軍は思いもよらぬ方法で都を攻め落とそうとしていた。
