It's been a while since I've read something edgy and melodramatic. It certainly gives an amateurish nostalgia feeling of the late '00s to early '10s, at least for me.
If I had read this manga as a teen, I would have enjoyed it a lot more than now. The message I got from this story was a "coming of age" of sorts: coming to terms with reality, maturing and growing up, deciding what to do in life, etc.
Overall the story was average and the hypothesis at the end was so irrelevant, used only to tie up loose ends so the world building remained coherent.