It's a great love story, a bit of baka-comedy, with two adults as main characters. They are likeable, also I like the fact that they are down to earth and have "normal" problems because it makes the whole story believable. And real-life-like stories are the kind I like the most. There are funny moments and other good points but the strongest point of this story is the plot and also storytelling. It's amazingly good. I wish all yaoi had storylines on this level. There's enough background, not too much drama, a lot of supporting characters who aren't flat or boring, moreover there's interesting side story in the main story.
The art is sooooo good, unfortunately the cover doesn't show it at all. Honestly that picture is so-so. Why did they even choose that one? Anyway there's also one shot (2 chapters-long) with sexy young characters, it's more on the funny side but with a drastic twist in it. What can I say? this manga is definitely worth to read.
One more thing, I disagree that there's not convincing "adults' cruel world narrative", I mean I had friends living in Japan and they depicted me pretty well the whole culture of work and job hunting in Japan, in other words how Japanese people work and treat their jobs. It's very different than in Europe, I was speechless a few times, when I heard about some of their habits, like - did you know that a common Japanese guy doesn't change his workplace/company more than twice in a lifetime? If a man in his thirties had 3 companies (or more) in his CV nobody would hire him ever again. In Japan changing a job is a bad thing, it's risky and unwelcome. It's just an example. In this light - I'd say this mangaka depicted this world quite well. It IS cruel, I'm sorry.