Shinobi Life Series by Shoko Konami

In order to save Kagetora from the treacherous Hitaki, Beni makes a deal with the devil and confesses Kagetora's true origins to Iwatsuru. While he's understandably skeptical about time-traveling rogue ninjas, Iwatsuru is savvy enough to see that if he vows to keep Kagetora unharmed, he can get what he truly wants...Beni as his own personal princess. But even Iwatsuru's motivations for his new "relationship" with Beni are much more than meets the eye... moreIn order to save Kagetora from the treacherous Hitaki, Beni makes a deal with the devil and confesses Kagetora's true origins to Iwatsuru. While he's understandably skeptical about time-traveling rogue ninjas, Iwatsuru is savvy enough to see that if he vows to keep Kagetora unharmed, he can get what he truly wants...Beni as his own personal princess. But even Iwatsuru's motivations for his new "relationship" with Beni are much more than meets the eye. Can Kagetora, still baffled by modern society, see through Beni's strange behavior to the truth about her feelings for him? less

It's back to the past for Kagetora and Beni, who are desperate to finally escape her father's manipulations. But when they are separated along the journey, what will happen to Beni, who is now completely on her own, lost a long, long time ago? Kagetora desperately fights to find her once again, but in the meantime, Beni meets some surprising new companions!