Where is the best place to exchange money in Japan?

I'm curious, what would you recommend as the most optimal location to exchange my currency in Japan? Are there any specific banks, exchange centers, or even online platforms that are renowned for offering competitive rates and swift transactions? It's essential for me to find a reliable and efficient service that minimizes any potential losses from unfavorable exchange rates and hidden fees. Could you please elaborate on your thoughts and possibly provide some insights into the most favorable options for someone seeking to exchange money in Japan?