Kazuya Kinoshita, the MC in this case whose life is followed in this manga, is written as a totally hopeless individual, void of anything redeeming, lacking in anything that makes you root for him, relate to him, or even understand him. How is it possible for a shonen anime mangaka to write such an uncharismatic character as the lead, even if that's the point you can at least give them something to latch on as contributing?
This person is a dumb virgin who has no shame being a weird pervert, can't stand up for himself, wastes his allowance in renting a gf, doesn't have a job, isn't good academically or anything else really, thinks he isn't a stalker but does exactly that, and also badmouths himself for being the looser he is, completely impractical, wandering in fantasies, and obviously has zero self-esteem. Ok, that's like half the shonen manga MCs, but the worst part is, he has zero character development as well which means he stays just as annoying from the start to whatever point you are reading this manga.
To contrast this, you have pretty much all (male and female) characters who are more sensible, have more redeeming qualities and are more charismatic, self-reliant, considerate, and helpful. MC on the other hand is trying to peek through the miniskirt of his ex who just came off insulting him to the point that even his bantering friends had to step in to make her stop. How is a character like this worth anyone's time?
The story is meh, started off decent as a comedy but soon becomes quite boring as you start feeling bad for the rented gf and what she's being put through really.
The art is girls looking good at times, and all other characters look lousily drawn.
