S1·E19 Ascend to the Ooku

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.