British pound · Japan — Currency exchange map

The Japanese yen (JPY) is the national currency; US dollars, euros, British pounds, Chinese yuan and South Korean won are the most exchanged. Tokyo and Osaka have the most offers, followed by Kyoto, Nagoya, Yokohama and Fukuoka.
Japan still relies on cash more than many countries, and exchange counters operate at airports, major stations, department stores and some banks. P2P offers let you swap USDT or USDC for yen or arrange a transfer.