I was reading bunch of adorable and touching soul mate fanfic in ao3 and that got me thinking. I don't recall ever reading soul mate manga, so are there any?
The closest one I can think of would be
http://www.mangago.zone/read-manga/kami_sama_darling/
Hope that might help.
Today I just thought of my first manga that i read over 10 years ago... and all i can remember is a a girl with long orange hair and bangs went to this shop that had a handsome man and he works with antiques or watches. He gave her a pocket watch that makes her go backward in time. Can someone find that if they read it before??