I read this manga a while back, and I just remembered it - it followed a ninja/samurai who, after falling into a lake, traveled to the future where he ran into a girl who looked just like his previous master who was a princess. Later on, it turns out the future girl's father is also from the past and her late mother frequently traveled in time?
Does anyone remember the yaoi where the seme writes a love letter to the "wrong" person? Its student × student. The seme was a good/popular student and the uke was considered creepy- they had dark hair and scary eyes? The seme finds the uke cute.
Thank you so much!!!!