Responses
i loooove the red string of fate and the soulmate markings tropes. virtually anything related to soulmates makes me extremely happy.
The closest one I can think of would be
http://www.mangago.zone/read-manga/kami_sama_darling/
Hope that might help.
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?