Koisuru Alpha no Sodatekata
I didn't like the incest vibes, and the implication that Masoh would be able to fix the grandparents to be kinder to the MC and love interest but then they were still jerks. The unresolved feelings of brotherly love to the dead brother are also painful, but a good painful I liked reading.
Nights Before Night
MODS
This is screwed up but has happy moments, I'll warn you though the sequel is freaking depressing
Dragon Sitter
This is really bittersweet, there's a lot of sad but also a lot of fluffy happy chapters. This deals with grief, loss, loneliness, war, etc. Maybe don't worry about the romance tag, it's mainly hinted at for MC or shown involving a bird person and a queen. The epilogue does hint there's a future romance for the girl though. There are depictions of self harm so be cautious reading this, though the chapter warns you it's happening.
Mangetsu No Ou