The plot goes by at breakneck speed and, unfortunately, that means that there's no time for anything but extreme reactions and tropes that have been done to death. It was funny how Suu sweet-talked Kei away from his ex-gf's place, but then they have sex immediately (despite Kei having been interested only in women before) and Kei instantly flips from being obsessed with his ex-gf to stalking Suu. At least it's not the twisted kind of stalking, I guess.
Some of the comedy is mildly amusing but, in the end, Kei is too dumb to be believable or funny for that long; I disliked how he ignored every concern and boundary that Suu tried to raise. None of the conflict has any weight, anyway, since Suu takes him back after telling him to go away (after a cliché "saving you from man who wants to assault you", nonetheless).
With such a poor plot, you'd think at least the sex scenes were hot enough to compensate, but no—they're just as rushed and unemotional as the rest. And, of course, there have to be parental issues in there, because we can't have a character simply like casual sex and not want to date anyone. It's a weird combination of 2000s plot and 2010s art, but the art's not enough to carry it.