Maybe something here http://www.mangago.me/home/mangalist/406644/
here all stories starts with something sad then ends up becoming heart warming & sweet http://www.mangago.me/home/mangalist/290491/
How about these two
http://www.mangago.me/read-manga/rift_conro/
http://www.mangago.me/read-manga/cut/

Hello. I’m trying to find some stories of yaoi that can start something like really sad but at the end has a happy ending . Thank you ٩(๑❛ᴗ❛๑)۶