Prequel anime to Touken Ranbu Kai: Kyoden Moyuru Honnouji. 
After a defeat in Odawara, Yamanbagiri resigns from his position as Attendant. Heshikiri Hasebe is chosen to be his successor. 
(Source: Crunchyroll)

One day, a new sword manifested at their citadel.
 
Fudou Yukimitsu: A sword worn by a commander of the Sengoku era, Oda Nobunaga, who was granted to one of his attending servants, Mori Ranmaru. Fudou Yukimitsu makes it known that he is proud to be Oda Nobunaga's beloved sword, but clashes with the other swords who also call Nobunaga their former master: Souza Samonji, Heshikiri Hasebe, and Yagen Toushirou. The appointed team captain, Yamanbagiri Kunihiro, must rally a citadel that has fallen into disarray at Fudou Yukimitsu's arrival. In the midst of all this, the saniwa has received an order to depart for the year 1582 -- the Honnouji event, where Oda Nobunaga met his demise...
 
Anime production was scripted and overseen by Kenichi Suemitsu, the director and playwright of the original play.

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