Chushingura: A 48th Loyal Retainer in Love (2016)

Set in the Edo period, a story revolves around Kiyo, a woman who strives to overcome status differences of those days. When she pledges to live for love, a knife attack occurs at Edo castle. And as a 48th loyal retainer, her fate changes after a raid on Kira: she is determined to serve at the inner palace of Edo Castle called "Ooku".