Concur, I very much like seeing shitty people getting their just desserts, but some plot holes that can be overlooked in a fantasy manga IMO cannot fly in a more realistic setting.
This chapter we discover that Yuriko was a relative newcomer (so make it 2-3 years max with the company), and in chapter 6 we learn that her presentations kept getting shot down by the higher ups (so she wasn't having much impact on the overall strategy) and her senior colleague was supposing that Yuriko sooner or later was going to leave and he didn't seem to have any particular issue with it. And yet, just a month after she's gone the remaining staff needs to do massive amounts of overtime to cover for her absence.
How did the office manage before hiring her? Did everybody else start slacking off while she was there? Hell, how did they manage when she had a day off? She
did have days off, didn't she?
And then there's the fact of her boss' boss having been demoted as a consequence of her departing. Surely not just for the increased overtime? From what I've always seen portrayed in media the office culture in Japan is that a certain amount of overtime is pretty much par for the course, so I doubt it would lead to a demotion just because the past month's hours have been higher than usual.
I'm struggling to find another possible cause for the demotion that fits the story... Perhaps Yuriko raised a stink on social media that went viral? But then, even if she went back to work it wouldn't resolve anything for the company?
Sorry everybody for the long rant, but I just wasn't expecting to have to employ this much suspension of disbelief in a non-shonen non-isekai manga...