I kinda liked it, a relaxed comedy with hardly any plot, perfect for killing some time with and smile a bit. However, you might want to skip out on chapter 89-90(the last two chapters), hell, skip the entire last volume (82-90), that's when it started to get a bit serious and weird/out of whack, which lead to the annoying ending where everything seems to have just been some kind of a make-believe world/dream/delusion created for some crappy reason and the mc is separated from the demon girl. What do I have to do to get a happy ending where they end up together or something, perhaps the mc can turn into a demon and accompany her or something? Threaten the mangaka's life? Even the "both become mortal and stay together"-type ending is good enough, even though I prefer the immortal or crazily long-lived option.
Fck, you don't just build up 90 chapters of emotions and ties between the main heroine and main character and then fcking separate them forever and "poof" nothing ever happened, it was all a dream, crazy how life does that, right? Damn it. I wish I hadn't read volume 10 at all, not worth it at all since it just made me feel annoyed, bothered and somewhat sad. I mean, I don't consider it a happy ending that he actually had a "happy" normal life with parents that are alive and own a real house, everything we got to know over 90 chapters went up in smoke. That's better than her and all of the demons(including his "dad") leaving him alone in that world to fend for himself, but, really, why even go for that ending when you can let some demons accompany him as family after she left, or just let her be there as well, or just recruit him or something as a demon to help with her goal. Separation like that ruins stories. Especially since he wasn't just separated from her, he was separated from that entire world and life, "waking up" into something like a parallel reality, seems everything was fake.