Mangas

Bakumatsu Renka Karyuu Kenshiden takes place in the first year of Tokugawa when the Shogunate and the emperor's supporters fight for supremacy. Shizuki Rin is a girl growing up in a Dojo who lost her memory of the past. Secretly the dojo deals with information. Including the violent Shinsengumi, some bishies and children who aim to get stronger.

Lots of bishies with one girl. Seems to have something to do with the Chinese zodiac at an elite school.