Compare the plug shapes, voltage and frequency in Japan and Equatorial Guinea, and find out which adapter you need before you travel.
Adapter required
Yes — coming from Japan, you will need a travel adapter for Equatorial Guinea. Japan uses Type A/Type B plugs, and Equatorial Guinea uses Type C/Type E, so the pin shapes will not fit any wall socket. Voltages differ (100 V at home vs 230 V abroad), so check the label on each device. Most modern dual-voltage chargers handle the swing without a converter, but heating appliances usually do not.
Japan (home)
Equatorial Guinea (destination)
Electrical specifications in Equatorial Guinea
More about plugs in Equatorial Guinea
In Equatorial Guinea, the standard power plug is Type C and Type E. The country runs on 230 volts at 50 Hz. That means wall sockets in Equatorial Guinea can be one of 2 different shapes — Type C, Type E, and your plug needs to physically match the socket to fit.
Full Equatorial Guinea plug guide