I know of the following
12 Visual Novels featuring the couples from the Saint Michael’s School for Girls
1 Visual Novel set in a nursing school with a different couple
An All Ages visual Novel (Hanahira!) which focuses on the juniors of Saint Michael’s
An OVA which is an adaptation of the 3rd Visual Novel with Reo and Mai (Difference is that Reo gets sick and Mai visits her rather than the other way around, then Mai gets sick after catching it from Reo)
Now a while back when i was looking where to get the Visual Novels i saw an image of a manga and it had Yuuna Matsubara in it but i wasn't sure if it was fan made or an official manga (i don't have the image on me, i didn't download it but i think i saw it in with Petals' Garden or Yuri Project), so i am wondering what other media belong to the Sono Hanabira series aside from the Visual Novels (and the OVA i listed)?
Please note anything which may be NSFW (Not Safe For Work)