Please be aware that whilst a travel adapter will allow you to physically plug a US plug into a different outlet it will not change the voltage or frequency of the supply.
Voltage - The mains voltage in Japan is 100 V which is technically not compatible with US appliances as it is too low (US voltage is currently specified as 120 V + /- 5%). The difference is however small and many appliances will still work perfectly well. If you have sensitive or expensive items such as medical equipment or computers you should check to see if they will work. Items such as these will often specify "100 - 240V" either on the equipment or the power supply (if it has one). If not then you may need a transformer to operate your appliance.
Frequency - Both 50Hz and 60 Hz are in use in Japan . The US operates at 60 Hz so if the area that you are travelling to runs at this frequency it will not cause any issues. If the area that you are going to operates at 50 Hz it makes little practical difference as most travel appliances will run at either frequency. Some items with motors, such as hairdryers and some clocks will run a little slower than intended but it is not likely to be problematic. Check your device - it may say 50/60 Hz which indicates that it is compatible with either frequency. If you are in doubt or you have sensitive or expensive equipment check with the manufacturer first as some equipment may be damaged by running on an incorrect frequency. Neither travel adapters nor transformers are able to change the supply frequency.Special considerations - "Eastern Japan 50 Hz (Tokyo, Kawasaki, Sapporo, Yokohama, and Sendai); Western Japan 60 Hz (Okinawa, Osaka, Kyoto, Kobe, Nagoya, Hiroshima). Older buildings have non-polarized sockets, in which case American polarized plugs (one prong wider than the other) would not fit. Many buildings do not have the ground pin. Sockets and switches fit in American-sized standard boxes."
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