Chizuru Yukimura, who has come to the city of Kyoto in search of her father, has been working with the Shinsengumi since she was saved from a blood-seeking monster. Then, in June of the first year of Keio, the Shinsengumi moved to Nishi Honganji Temple to continue their patrol of Kyoto, and received reports of the frequent appearance of "bandits who assume the name of Shinsengumi. At the same time, Shinsengumi is order to protect the Shogun Iemochi who will visit Kyoto, and Hijikata and the others are in a hurry to solve the case. 

Meanwhile, several rasetsu escape from the Shinsengumi post with the help of "a figure resembling Chizuru." In addition, Chizuru, who had gone to the city with Sakai, the treasurer, are drawn into the fray and goes missing. The Satsuma domain receives information of a plot to assassinate the Shogun by Tosa domain's ronin, and Kazama and the others head for Kyoto. Are the various incidents surrounding the Shinsengumi a coincidence? As everything becomes chaotic and the time until the Shogun's arrival in Kyoto approaches, Hijikata and the Shinsengumi must decide... 
 
(Source: Crunchyroll)
 
Episodes: 
Chapter One (第一章), November 13, 2021. 
Chapter Two (第二章), December 11, 2021. 
Chapter Three (第三章), January 29, 2022. 
 
Note: The episodes streamed in advance on the U-NEXT service ahead of the official BD/DVD release. These OVAs will have a Blu-Ray/DVD release on December 24, 2021, January 28, 2022, and February 25, 2022 respectively.

Episode 1 - Capital of Snowflakes

Episode 2 - The Seeds of Discord

Episode 3 - The Flower that Blooms in Twilight

Episode 4 - Those Who Come From Darkness

Episode 5 - Opposing Blades

Episode 6 - The Devil’s Existence

Episode 7 - The Fetters of Fate

Episode 8 - Fleeting Dreams

Episode 9 - Wake of the Slaughter

Episode 10 - The Course of Bonds

Episode 11 - Those Who Fall

Episode 12 - Beyond the Clash of Arms

Studio DEEN

NBCUniversal Entertainment Japan

Otomate

Hakuoki ~Demon of the Fleeting Blossom~ (2021)