I find it REALLY weird how this particular manga makes use of the "horrible black-company" trope.
Basically, every single time something horrible is about to happen, the MC has a flashback to his time as an abused Japanese worker, and actually has an inspirational, motivational speech from his seniors about trying his best, pushing through, and making the impossible, possible -- which helps him recover from whatever situation there is, and gain courage.
....And he received that courage, from his former abusers.
.........I feel like the author shouldn't even try to paint the MC's time in there as positive, on any level. That's like a freed slave going: "my time in the mine-shafts taught me not to be picky about food! Yum yum moldy bread!"
I feel like I can generate an info dump that'd go around in circles, around that idea, so I'll just cut it short. I just find this manga weird, for that reason alone. It really puts me off.
EDIT: A part that makes this weird for me, perhaps, is how much I like Gurren Lagann, and the whole idea of "pushing through with guts and bravado" is so much of that anime, that seeing it being superposed onto abusive capitalists just makes it extra irksome for me.