While the voltage of electricity in Japan is 100V, it has two different frequencies depending on the area.
50 Hz – eastern & northern Honshu (including Tokyo)
60 Hz – western Honshu (including Osaka & Kyoto), islands of Shikoku, Kyushu and Okinawa.
The plugs are two flat pins, and of course we can get an adapter plug to connect our devices.
When traveling to Japan should not have any problem in using our electronic devices such as laptops, cameras, etc., provided they support international voltages and frequencies, which is usually indicated for example 100-240V and 50-60Hz.
If you are planning to bring electric appliances from your country, do check if it supports 100V of electricity, as it may not work normally here in Japan.
Curious to see in Japan as everywhere there are towers and power lines distributed in a somewhat chaotic order.