That being said it's not just software developers, it's practically everyone. Oh the horror stories I hear about my sisters-in-law.
Real work culture varies from company to company here, and isn't that different than US work culture overall.
There's a stronger social contract in place than in other places. Work culture is harsher in terms of hours expected in the office than elsewhere, but there is a stronger respect for workers' material conditions as well.
Japanese companies in general have an abhorrent work culture.
Let me hand wave cultural relativism for a second - sure, fine, it works great for the Japanese, or whatever, historical and cultural significance, fine. But I think I can make health arguments against it, let alone moral/value ones.
I wish they'd explore Visas for remote workers - partner and I are very interested in doing a spell in Japan, but we have absolutely no interest in participating in the still-majority work culture there. It'd be remote only, or a foreign company.
I was shocked to discover that Japanese employment law has changed dramatically vs the perception. Someone died a few years back apparently, so the Japanese government stepped in. They closely monitor logged overtime hours. Bosses whose employees persistently log long hours (I think it is 60+ hour weeks) get a warning, first from HR internally, then the government itself. It's a big deal.
They have a "no overtime Wednesday" every week, and a "Premium Friday" where workers are encourage to go home in the early afternoon.
I went in imagining people sleeping at their desks, etc, but it was the opposite..My Japanese co-workers are surprised at how much I worked! At this point, I wish the U.S. would adopt Japanese labor laws.
[0]: https://www.scmp.com/news/asia/east-asia/article/2174669/wat...
So what would a normal working week be? A warning at 60+ hours is hardly reassuring.