Musashi's companion Kojirou Kanemaki learns that his father was a member of the Uesugi clan when Musashi saves Michiru Saruwatari from a monster.
Kojirou, along with his fellow Kanemaki clansmen, chooses to join Uesugi's punitive expedition against the demon king of Awajima Island, Yamata no Orochi, an eight-headed dragon that threatens to consume the entire region, in order to discover more about his family's history.
When Musashi joins Uesugi's military alliance, however, he is confronted with the grim reality of battling formidable demons. The humiliation of his powerlessness and incapacity to function in groups means he must learn to cooperate with his newfound supporters.
Meanwhile, the Obsidian Eight, who have been searching for Musashi in their pursuit of the Obsidian Goddess who resides within his body, have resumed their search and have devised a scheme to sabotage the current island operation.
As the situation becomes more and more chaotic, Musashi and his allies must foil the plots of the numerous groups working together to capture the Obsidian Goddess.
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