Yama fu-tang manga

Yama Fu-Tang summary:

From Manga-Updates: An adaption of Futarou Yamada's novel "Kunoichi Kokihei", this story begins the year before the Battle of Sekihagara, in the pleasure quarters of the capital. Kagerou, a real beauty who is a child of the Ootani family, meets five of the most powerful men of the Uesugi clan while serving at a brothel. But sometimes appearances can be deceiving...