I've lived and worked in Tokyo and Japan for the last few years.

In my experience, most Japanese companies offer salaries up to 10M-12M yen for the most experienced software engineers.

If you are aiming higher than this, you may have a small selection of companies available. In my personal experience, the only engineers I have seen earning 20M or more were at Google or Mercari.

You will undoubtedly have more options for work in your current situation.