Originally Posted by
CrazyInteg
FTA, anyone here can tell you what happens at Narita, but you basically get off your plane, and follow the line to the transfer area. (PROTIP: use the restroom in the plane before landing).
Just a note. There are toilets on the left side about halfway through the seemingly endless corridor that arriving passengers follow before splitting into transit and immigration lines.
No need to risk possibly violating the "prepare for landing" instructions.