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As others in this thread have said, buying a property in Japan doesn't extend your Visa or grant you residence in the country. This would be a waste of time if you didn't already have that lined up. However, there are countries that do. Some have what's called the Golden Visa program, or Investor/Real Estate Visa program (there are other names, but if you're doing a search, this should turn up decent results). Here's a list of some countries that do this, and the minimum amount you need to spend.
Portugal - Golden Visa Investment - €500,000 ($540k USD) or €350,000 ($380k USD) for lower population areas, or properties that need to be renovated Residency benefits - Residency permit for 5 years, with the opportunity to apply for permanent residency after that
Spain - Golden Visa Investment - €500,000 ($540k USD) Residency benefits - Residency permit for 1 year, renewable as long as you own the property, and you can apply for permanent residency after 5 years
Greece - Golden Visa Investment - €250,000 ($270k USD) Residency benefits - Residency permit for 5 years, renewable as long as you own the property, and you can apply for permanent residency after 7 years
Thailand - Thailand Elite Visa Investment - THB 1,000,000 (about $30k USD) for a 5 year Visa Residency benefits - Renewable every 5 years with no residency requirement
Ecuador - Investor Visa Investment - $42,500 in real estate Residency benefits - Grants you permanent residency
Malaysia - Malaysia My Second Home (MM2H) Investment - RM 1 million (about $240k USD) in real estate Residency benefits - Grants you a 10 year renewable Visa
Philippines - Special Resident Retiree Visa Investment - $50k in real estate Residency benefits - Grants you permanent residency
When I was looking into bailing on the US, I made a Libre Office spreadsheet with like 70 countries and all this info plus a bunch of other personal requirements for what I was looking for, so some of it may be outdated. Hell, some of it may be straight up incorrect, so feel free to double check it.
Portugal doesn't have a property based golden ticket visa as of October 2023 due to concerns that it was affecting real estate prices in cities like Lisbon and Porto. But you can still donate 250K euro in cash or invest 500K euro in a local business that leads to job creation (among a couple other investment options). Another option for Portugal is the D7 visa, which requires you to live in the country 6 months the year for 5 years, but requires foreign income of 10K euro per year. Either way, after 5 years, you're eligible to apply for citizenship.
That's... shockingly affordable if you already have equity in some real estate