Why would you be surprised by their "lack of work ethics"? They got fucked hard, so it's understandable that they aren't going to care much for "the man" anymore: they were told their contract was to work like mad in their studies, get to a good university and end up landing a good job in a multinational where they'd work their whole life slowly climbing up the hierarchy and pretty much guaranteed they'd be there for life.
Instead, at the end of their studies they found an utterly slaughtered job market and a crappy economy in which Japan has been stuck for 20 years (especially those who got out during the Lost Decade of the 90s).
They don't have "good work ethics" because they've managed not to be stockholm syndrome victims, and because reality showed them strong work ethics didn't matter, and promises were there to be broken.