The culture at companies is extremely dependent on the company - a traditional employer might expect the prototypically Japanese extreme deference/obedience to hierarchy, but it also seems that there are plenty of companies that "get it" and don't play that game, as well as the full set of FAANGs and foreigner-run companies that follow a totally different set of rules than the old school businesses here; and it's also subject to change considerably now that model companies like Toyota are moving to merit- instead of loyalty-based promotions, but that kind of shift takes a long time to take hold.
Your job options are much smaller if you don't speak Japanese, but jobs exist, I know people who have gotten them, and they tend to be in the international- or international-style companies. Wages for foreigners strangely are generally decently higher than for locals, I hear, even if not knowing Japanese is more of a handicap than a help lol.