The village of Ootsuka—home to Shino Inuzuka, Sousuke Inukawa, and Hamaji—was lit on fire under the preconception that a virus had seen all of its life eradicated. Now surrounded by flames and on the verge of death, the three were approached by a strange man holding a sword. He tells them that they must reach a decision if they want to live. That night changed everything for these children. Five years later, the family of three now lives under the watchful eye of the small Imperial Church in a nearby village. All is fine and dandy until the Church attempts to reclaim the demonic sword of Murasame. To accomplish this, they kidnap Hamaji to lure Shino, now a bearer of Murasame's soul, and Sousuke, who possesses the ability to transform into a dog. The brothers must put their differences aside to rescue their beloved sister from the Church in the Imperial Capital, signalling the beginning of a very difficult journey.

Second season of Hakkenden: Touhou Hakken Ibun.

The year is 1863 and as Japan's long festering wounds of political discord erupt into violent waves of street clashes and murder, the Tokugawa Shogunate sends a new force of masterless samurai called the Roshigumi to the aid of the Aizu forces in Kyoto. However the new "police" are anything but a cohesive force and assassination has already split them into two opposing factions. The stronger is led by the brutal Serizawa Kamo and the lesser by the more honorable but less assertive Isami Kondo. It is into this pack of wolves that Ryunosuke Ibuki is dragged by the rabid Serizawa. Forced to be a virtual slave by blood debt, he hates the samurai and everything they stand for. But as he sees how the other half of the samurai live, he begins to believe that there may still be a chance, for both himself and Japan, if only Kondo will step up and take down the mad dog Serizawa! (Source: Sentai Filmworks)

This OVA takes place in between episodes 8 and 9 of the first season of Hakuouki. Yukimura Chizuru goes on a reconnaissance mission in Shimabara as a geiko for the Shinsengumi. Each episode unfolds the events of the days leading up to, during, and after the operation. It intermittently reveals each captain's involvement as well as that of a few demons in the affair. Each individual episode primarily focuses from the third person perspectives of: Okita Souji, Saito Hajime, Harada Sanosuke, Toudou Heisuke, Hijikata Toshizo, and Kazama Chikage.