Responses
This kinda matches with your request, hope you'll like it ^^
http://www.mangago.zone/read-manga/the_man_in_the_mirror/
Omg thank you I just saw your reply, gonna check it out
Where two characters are from different times/eras and they meet somehow and in love with each other
Example:
http://www.mangago.zone/read-manga/nemureru_tsuki/
A Manga like that