Responses
I looked at the tag, and found only one. http://www.mangago.zone/read-manga/hanaiki_kasoku/
http://www.mangago.zone/read-manga/tsubanakasu_haru/ (it's not the hanahaki disease, but the uke has another disease that causes him to grow flowers on his body. it's ongoing though, and only has 1 chapter out)
Is there any stories that involves hanahaki disease? It just seems really interesting.
(Hanahaki disease: a person coughs up petals of flowers when they suffer from one-sided/unrequited love)