Disclaimer: I don't claim to be an "expert" or anything about Japan, the following is based on my experience living in Japan, attending a Japanese uni and studying Japan society and such. Don't jump on me.
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I remember discussing this topic (marriage, family, work) with fellow students at the well-known university I studied at in Tokyo. Pretty much all of them were younger than me (it was last year, I was 24) and it was depressing as hell. All of them were acknowledging that something was wrong and that maybe something ought to be done about the way the system was, but they had litteraly no will do be part of it, that it was "too late" for them.
They were students at a big name Uni, which means they're pretty much guaranteed to land a job somewhere, whatever it is*, and they think it will be like for their parents and everything will be smooth sail from there on. When we talk about those topics, those who will consider the discussion seriously tell me that even if they're running towards a wall, there's no other option because that's how society is and going against established (and outdated if you ask me) expectations will only ostracize them. Not all girls are against being housewives, some polls even show the opposite, and most men, even young ones, think women's place is at home raising kids... Even if they don't think it's necessarily good for their situation.
* I think it's not an exaggeration to say that in Japan, the name of the Uni you went at is more important that what you actually studied. I have a fellow French friend who's doing financial control in a well-known Japanese company. He did a business school, of course, and worked at another company before landing this job. Every year, he gets new people in his department who are coming fresh out of Uni, most of which know zilch about anything related to the job. Ie. one of the new girls this year had majored in French litterature.