The little I know about Japan is from Anime, books, articles and online comments.
In Japan, leaving before the boss is distasteful. Also, going home early instead of socializing after work is frowned upon even by one's spouse.
I've also read that there's no job hopping. Employee for life is still a thing there. And an ex-employer's comment is heavily weighted by prospective employers.
Additionally, loyalty is highly valued, probably more than ability.
This Wikipedia article is a good summary of Japanese work environment - https://en.wikipedia.org/wiki/Japanese_work_environment