3 types of mangas exist. Good, crap and mediocre. Kanojo wa Kannou Shousetsuka falls into the mediocre category.
The artwork is pretty good. It's nice and clean, easy to understand what's happening with a quick glance (unlike some manga's artwork that leaves u gobsmacked to what's happening even after staring at it for 60 seconds).
Story is so-so, not interesting, a bit of suspense, and really no plot twists (as far as the first 40 chapters is concerned)
So that leaves the character devlopment to be the judging factor of whether its entertaining or not. Basically the below summarises the first 40 chapters.
First ten chapters will
make you expect some good character development
Next 20 will leave you craving for more character development that it has yet to adequately provide. The stalemate continues.
Next ten chapters will basically give u a quick, rushed, unrealistic character development of the heroine.
Last fifteen chapters, I've no idea cos it hasnt been translated yet. Doesn't matter though, this manga is mediocre enough to go in my dropped list.