Senhime (千姫) (May 26,[1] 1597 – March 11,[2] 1666), or Lady Sen, was the eldest daughter of the shōgun Tokugawa Hidetada and later the wife of Toyotomi Hideyori.
She was born in 1597 as the eldest daughter of the then-daimyo and later shōgun Tokugawa Hidetada and his wife Oeyo during the Warring-States period of Japanese history.
When Osaka castle fell, Hideyori committed ritual suicide beside his mother, his son was executed at the age of 7 years old.
Stories tell that Senhime refused to marry Naomori, whose face was ill-favored because of the burn he got when he saved her, and rather preferred handsome Tadatoki.
As was the tradition for a widow at that time, Senhime cut her hair short and became a Buddhist nun, taking the name Tenjuin (天樹院), moved back to Edo and spent the rest of her life there.
Shortly after her marriage to Honda Tadatoki, they moved to Himeji Castle, a present-day world heritage site whose west wing was mostly constructed at that time.
The film begins from the siege and fall of Osaka castle and tells the fictionalized story of Senhime's later years after the death of Hideyori till her final confinement to the Buddhist temple.