Musashi, Kojiro, and Tsugumi meet up with the gathering Uesugi Alliance in an effort to learn more about Kojiro's father. But with a battle against the Kishin of Awaji Island looming, the assembled forces might not be in the mood to indulge outsiders...

After volunteering to take part in a duel for the leadership of his unit, Musashi is confronted with a grim reality.

Musashi's troubles in the Shimazu Unit seem to get worse and worse, with accusations of desertion and espionage thrown his way. At least he can turn to the gentle Michiru to take his side... or can he?

With the connection between Musashi and Michiru, the location of the Goddess Obsidian ends up being discovered by Yataro, who immediately warns the Black Dogs, and the group assembles a strategy to recover her.

Two of the Obsidian Eight are assaulting the Uesugi castle with Yamata no Orochi, while a third member kidnaps Musashi and tries to convince Michiru to kill him.

Battle lines are drawn, with the Obsidian Brotherhood out to defend Yamata no Orochi and capture the Obsidian Goddess, while Musashi works with the Uesugi Band to slay the Kishin and rescue his friends.

Naoe Kanetatsu of the Uesugi Bushi is facing off against Inukawa Seiroku of the Obsidian Eight. But how can he hope to defeat someone whose power seems to be inflicting physical trauma at will?

Shiro's unique powers are enough to overwhelm an entire group of Bushi by himself. Does Naotora really stand a chance?

It's up to Musashi's squad to defeat Yataro, but the Shimazu siblings heading up their assault don't seem to be on the same page anymore.

The struggle to keep the white serpent from empowering Yamata no Orochi becomes desperate, as the truth behind the friction among the Shimazu brothers is revealed.

Yataro re-emerges, a greater threat than ever. With Michiru enslaved to his will, he may be unstoppable...

Musashi has unlocked a portion of the Obsidian Goddess' power. But even if he manages to defeat the Kishin-powered Yataro, will he be able to save Michiru from her father's machinations?