Hakuouki season 4 anime
This OVA takes place in between episodes 8 and 9 of the first season of Hakuouki.
Yukimura Chizuru embarks on a reconnaissance mission to Shimabara, as a geiko of the Shinsengumi. Each episode reveals the events that took place during, after, and before the operation. The episode occasionally reveals the involvement of each captain as well as the demons involved in this affair. Each episode is primarily focused from the third-person perspectives of Okita Souji and Saito Hajime, Toudou Hiesuke, Harada Sanosuke and Kazama Chikage.