Ascend to the Ooku - S1.E19

Atsuhime moves to Edo castle where she meets Honjuin, Iesada's mother, and Takiyama who is in control of the servants at "Ooku." However, the meeting with Atsu-hime's to-be husband, Iesada, was unscheduled. She learns that he has a concubine. One day, Atsu-hime sees a man playing hide-and-seek in the garden and hears him being addressed as "shogun.