Japan has a remarkably huge economy considering its population. It’s also very hard to get into the Japanese market because of its unique and drastically different culture.
There also isn’t much startup innovation because the culture isn’t so “fight and scream to the top of the economic ladder” like in America.
Guess who knows that culture, and wouldn’t mind a startup?
Of course it’s one of the most expensive places to live in the world, and the capital needed for startup is equally out of this world. Still, its something to keep in mind.