You might read this series, perhaps get drawn into it, and wonder what the hell all the people who gave it such a low rating were smoking. Did they expect something else? Were they prudes and objected to some of the content? And then you come to the ending and it all becomes clear.
There are happy endings, there are melancholic endings, there are tragic endings. Any of those three types would've worked here if done well. What we got instead was a troll ending, a big middle finger thrown to the reader.
This short series started out as a 7/10, became
a strong 8/10 towards the end, and ended with the dumbest finale imaginable. I'm talking Gantz TV or Mai Hime finales dumb here, though in a very different way from both. Instead of the premise spiraling into dumb, here the main character does something so ridiculously stupid that you just stare at the page in shock and think WTF??
So I was enjoying it a lot until then, it had a lot of promise, and was only getting better, and then it got a rushed final arc leaving lots of unresolved plot points and ending with ... dumb.