Finally got around to finishing this. Overall, it was within my expectations for a light/web novel. The writing was okay, though it seemed to get repetitive at times, reiterating events and recycling the same thoughts over and over. I wonder if that would work better when following the story as it was published, but for a binge read it became tiring. It felt as if the author couldn't trust the readers to understand what's going on.
I think my favourite part was seeing Haruki's gradual breakdown with the new boss. It was very in-character for her to be bottling up all the pressure and try to appear in control, while slowly crumbling inside. I can't say I liked Mizuno as much as a character, but she was fitting for Haruki, I suppose.
I agree with previous commenters that Youkouchi was a very flat and uninteresting villain. And the whole situation was resolved a bit too easily.
Terauchi was actually a much more offensive character than Youkouchi in my opinion. The way Haruki was still talking to him normally after he practically assaulted her was very strange. I don't understand why the author presented this situation so lightly. It could have been interesting to have Haruki pretend to be okay with talking to him, while feeling completely differently internally —fitting for her character and also an opportunity to later show that she decides to take action when Mizuno is involved. But even in Haruki's thoughts, she didn't seem to take it seriously enough.
Lastly, on the matter of Kiyo. I'm cis-gendered, so I'm not the most qualified to speak on this. That being said, the author's the characters' insistence to point out that "despite how it may appear, this is a man" was uncomfortable to me. At first I thought that it was a cross dressing man. However, how Kiyo described themself seemed more akin to genderfluid, which made the constant "HE'S ACTUALLY A MAN" repetition weird. They even mention how annoying it is that people always try to label them as man or woman, when that is what the characters have been doing this whole time. I think the author really fumbled the whole thing.