The most unrealistic thing for me was, that our MC, a wonderful person ( from what we see on the Flashback when he joined the company), that went to a good Uni, on which he was part of the Rugby team, and apparently made some good plays since he remember the public cheering for him, never had a girlfriend ? let alone a crush ?
That for me is more depressing than the soul crushing job, and if you are on a similar place to our MC, instead of working through lunch use that time to find another job, hell use your vacation/sick days if needed.
I fell that blonde guy, neuron ? , Voice and identical character design have in a shitton animes before, that being said I have heard this is a manga clásica with any luck this will be a worthy adaptation.