Thank you that is very true I want to buy BTC with USD in japan, but no option.
Why do you force yourself to buy BTC with USD when it's much easier and convenient for you to buy using your own currency (Yen).
what do you mean fee? you can try to buy on the market using USDT, you can set your buy price as you want, so you can buy at any price that you want. or you can find your bitcoin seller or people that want to sell their bitcoin
He probably means the trading fees or withdrawal fees either way you'll have to pay for both. Some exchange have lesser fees but the rates could be worse though.