child adoption

I want to read something with child adoption as a main theme. Necessarily story with modern setting. Don't recommend me stories where parent and child are developing romantic feelings toward each others like in Usagi drop. I am interested more in straight stories, but BL is also ok as long as adoption is MAIN theme.
Something like:
- https://www.mangago.zone/read-manga/no_you_na/
- https://www.mangago.zone/read-manga/saihate_ni_madou/