Luckily for Japan, that toxic work culture that leads to their notorious overwork deaths is anathema to SJW infiltration - The effects leading to it are less about actual productivity as the image of being self sacrificing for the company. Bringing identity politics into it is a hard no-go (Worrying more about yourself than the company and your work output is almost the fundamental opposite of expectations), and anyone who hardlined it would just be shown the door. And the company culture itself will breed more managers in that "fuck your life its about the company" line, so its self sustaining.
They have a lot of problems to deal with in their offices, but I doubt SJW attitudes would join that list anytime soon. Similarly, Japan is extremely xenophobic, both in leadership and the general populance, and isn't particularly accepting of people not following social norms. The first Muzzie to try and set up a sharia law zone is going to get shot by the police before he finished trying to explain what a Quran is. That xenophobia is also going to continue to serve well to prevent SJW transplants from starting new organizations in japan, to try and bypass that cultural work attitude.