If you are departing from a country other than Japan, entering Japan via Narita Airport and connecting to a domestic flight, you will be required to temporarily enter the Public Area. Therefore, you must undergo an additional screening before boarding your domestic flight.
In compliance with the Customs Law, all passengers entering Japan must undergo a customs inspection. Therefore, all passengers entering Japan via Narita Airport in transit to domestic flights must collect their suitcases and other checked baggage.
Carry-on liquid restrictions do not apply at the domestic screening areas. However, as with international flights, checks are conducted for prohibited items other than liquids in carry-on baggage.
For examples of prohibited items, see the Prohibited Carry-on Items List page.