This website explains the screening process at Narita Airport.

From International to International Flights

When arriving at Narita on an international flight and departing for an overseas airport

Security screening is required at Narita Airport.

Due to variations in security screening criteria in Japan and other countries, you must undergo an additional screening in Japan before transferring to your international flight, even if you have already received a screening at another overseas airport.

Please be aware that there are restrictions on carry-on liquids.

Restrictions on Carry-on Liquids will be applied at the screening areas for international flights.

See the figure at right for quantities of liquids permitted on board the aircraft.
For more details, please see the Restrictions on Carry-on Liquids page.

Note: If you are carrying liquids in excess of the permitted quantities, you will have to voluntarily dispose of them at the security check for transit passengers, even if the liquids are liquors, perfumes or other duty-free items purchased in the duty-free area of the airport from which you departed.

What about liquors, perfumes and other duty-free items?

The carry-on liquid restrictions also apply to liquors, perfumes and other duty-free items.
If Narita is your last transiting airport, you can purchase any products with quantities exceeding 100 ml (g) at the duty-free area in Narita.
Otherwise please purchase any products with quantities exceeding 100 ml (g) at the duty-free area of the airport in which you will undergo your final transit security screening.

Total capacities of containers must not exceed 1 liter (1000 ml)

What about liquids which is placed in STEB?

Passengers traveling internationally into Narita airport with a connecting flight will be permitted to carry liquids in excess of 100 ml (g) in their carry-on baggage, provided they were purchased in duty-free shops and placed in Security Tamper-Evident Bags(STEBs).
iquids that cannot be screened and cleared will not be allowed to remain in a passenger’s carry-on baggage. Passengers may elect to place these items into checked baggage, if available, or forfeit them prior to entering the departure area of the airport.

Medications, baby formula and food, and breast milk are allowed in reasonable quantities exceeding 100 ml(g) and are not required to be in the zip-top bag. Declare these items for inspection at the checkpoint.

Carry-on items other than liquids will also be screened

Checks are also conducted for prohibited items other than liquids in carry-on baggage at the security checkpoint for transit passengers.
For examples of prohibited items, see the Prohibited Carry-on Items List page.

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