Responses
Judging by the note on chapter 1 it sounds more like Jun's her self insert.
Definitely both, but more leaning to Yaharu, especially about his family. Both of her MCs in Aftergod are depressed people who have family issues too.
Definitely best BL manga I've ever read in the last 10 years. Yaharu is definitely author's self insert.
As expected from Aftergod's author. Y'all should read that one too, the MC is like Yaharu, and there's someone who's gay for him too like Jun.