Sangoku Rensenki Sakigake

Set in a time prior to the previous 'Sangoku Rensenki' games. A completely new work with brand new characters.

A high school girl finds a mysterious book and falls back in time to an era that seems like Three Kingdoms China.
It's an era of intense fighting where the love interests are all warring for control of the world, a very odd bunch of 'dark hero's'.