Renai Tripper

From Fate: Niina went back to the past and landed in 'Hakkenden's (eight dog warriors) world. There, she met Satomi clan's young master, Satomi Takemasa. According to him, Niina's the reincarnation of one of the Hakkenshi. In order to beat their worst enemy, Tamazusa, they need Niina's power?