An investor purchased a studio apartment for investment purposes using a loan that requires long-term repayment, but later became unable to repay the large amount of debt due to increased vacancies or the burden of paying expensive repair costs, etc.
Many ordinary investors are interested in expensive new and used studio condominiums, attracted by the fact that they can save taxes and provide income in lieu of a pension in the future if they pay off their debts. Many studio condominiums are publicly listed almost every day in real estate auctions under the jurisdiction of the Tokyo District Court and other authorities.
Don't just think about the investment yield when the room is fully occupied, but think about "what is the worst case scenario? It is one of the most important real estate investment know-how for investors.