I get feeling that way, as a teenager; there is stuff you just Don't Know until you've lived long enough to endure (or live through) the times that teach you the lessons, a direction, and mechanisms of self care.
So... I get Liz having an issue like this.
(Wow, do I ever get it)
So, please tell me, what in the actual F is up with Miyabi just... coasting along?!
He knows how important this shit is, both to Liz and to himself!
And he... what? For some asshole reason, he's not mentioning to her that she needs to step up; he doesn't say a fucking thing about the report they worked on, to maybe help her look at things differently; he's just... silent.
I mean... after bragging about how cool and heroic he is by demanding that he work for free (or at least refusing as much money as he possibly can), and refusing to admit the truth of his deeds in favor of Liz taking equal credit?
After all that, she is absolutely going to look to him for assistance, and consider him a friend; she is totally the closest thing he has to a friend (and although isekai MC's tend to be written as sociopaths for some reason, he's not too bad).
He should be helping her, to say the least; the behavior in this chapter really feels like a social betrayal.
Like... gross and maybe creepy; especially with the constant undertone of "girls are less than boys" the author has going on.