[Hakuouki] the Legend of the Bakumatsu: the Glass Sky

What if... This world is really just a dream. It will not be destined to follow history. So, maybe this sad ending can be changed? At that time, I... I once believed so deeply... **** The story of a high school girl, Ruri, who travels through the end of the shogunate and encounters the Shinsengumi and the ghost clan. As a historical witness who knows the future How can she turn the tide?