This is COMPLETED (on the site below)
https://mangadex.org/title/ed528b5d-e7f8-458e-a1cd-6844f0f2b760/sora-no-aosa-o-shiru-hito-yo
According to Baka-Updates
4 Chapters (Complete)
P. S. Contains SMUT scenes
According to Baka-Updates
9 Volumes (Complete)
According to Baka-Updates
5 Volumes (Complete)
According to Baka-Updates
2 Volumes (Complete)
According to Baka-Updates
5 Volumes (Complete)
According to Baka-Updates
6 Volumes (Complete)
33 Chapters (Complete)
P. S. You can read the sequel here
https://mangadex.org/title/9f73124c-ecfa-49f7-b4e4-0c699cc65957/jishou-akuyaku-reijou-na-tsuma-no-kansatsu-kiroku
This is COMPLETED (on the site below)
https://mangadex.org/title/48153c80-083a-4506-9439-72147d628c29/uchi-no-danna-ga-kawaisugiru-ken-ni-tsuite
According to Baka-Updates
2 Volumes (Complete)
According to Baka-Updates
3 Volumes (Complete)
I think it's completed
Sora no Aosa o Shiru Hito yo