Well you left one of the happiest countries in the world to live in a not very happy country (according to research). Without knowing anything about you I find it hard to believe your day to day is any happier than it was in the Netherlands. I moved to the Netherlands from a country that pays developers very good money but had a million other problems...so it's really not all about the money.

Wow, that's the first time I hear this. Care to share why did you choose Japan out of all places?

Global and a few Japanese companies in Tokyo pay well compared to Europe. E.g. you can make 200+k$ total comp if you have skills in demand (ML, etc.), which is hard in Europe outside management consulting/finance.

How that compares to the US depends on your life choices, etc. I am aware I could "easily" earn 2x in SV, but I hate living in suburbs while I can cycle to work in Tokyo and live in one of the most vibrant city in the world.