Here's another name for this manga
"Bad Parenting and it's Consequences"
Man, it's some HEAVY reading. But overall, pretty damn good stuff.
I REALLY don't get the people complaining about the ending? Guess they were here for the emotional torture porn and the happy ending didn't sit well with them. Sure, author could've stretched it out, but I don't think that would add much to it.
I mean, the biggest "Yes, people have quality and defects, what's hard to grasp about that?" was set a few chapters before. That aside the point of the ending is "Talk with each other" and it showed what happens when people reach out and try that instead of just lashing out or letting things stew.
Again, yeah, we could've have a few chapters showing them extensively talking with each other, but it wouldn't add much to it, if anything, people would've complain about the ending being slow and boring.