Continuation of the Ginga Eiyuu Densetsu: Die Neue These series.

In the late Edo period, Japan had experienced an unprecedented crisis by Kurofune (Black Ships), the ships from foreign countries. But a giant robot called Onigami, which has existed since ancient time, dispelled the Kurofune ships and the exclusion of foreigners was accomplished. The story begins in Japan where Meiji restoration in 1868 didn't happen. The tagline says, "I can be the greatest man in the world, because I am a virgin!!" (Source: Crunchyroll)

Hot Spring-themed OVA of Haiyore! Nyaruko-san W.

The war against the Tokugawa Shogunate ended years ago. But there are some who are not happy with the outcome. Shigure Takimi watched his friends and family get slashed down in the name of freedom and prosperity. Now he and a band of desperate rebels have sworn to settle one final score. Only one man stands in their way: Kenshin Himura. But when Shigure discovers Kenshin's true identity as the Hitokiri Battousai, his fight becomes a personal vendetta. (Source: ANN)