Lady Ochiba returns to Osaka in order to accelerate the Regents' campaign against Toranaga. In Ajiro, Toranaga tests Mariko's loyalty to his cause.

Mariko arrives in Osaka for the fight of her life. Blackthorne and Yabushige scramble to save their own heads as their options dwindle.

In the wake of a tragic death, Blackthorne finally considers the true nature of Toranaga's plan.