Comment by omoikane

In 2021, USD to JPY exchange rate ranged from ~102 to ~115, and the average was ~109. The actual exchange rate could be a bit less depending on where you make the exchange, so 100 USD to 10000 JPY doesn't seem like that much off.

(For example, I noticed that if I buy something from Amazon or try to pay for something using Paypal, the exchange rate they offered me is consistently worse than the market rate if I elect to pay with USD instead of JPY. The difference often adds up to a few dollars, even accounting for foreign transaction fees that my bank might charge.)