There is a fast lane service for passport control at NRT, but it is still experimental stage. Need a pass to use a fast lane and the pass is given to passengers via airlines. Not much information regarding how many passes which airlines get. Also, it is up to each airline to decide which passengers get a pass. The fast lane is available only to non-Japanese passport holders
At NRT, once you go through a transit area upon arrival at NRT and come out on departure gate side, then there is no way for a passenger to go through a passport control/customs and come out on land side of the terminal. This is the way all Japanese airports are set up.
If you want to come out on the land side then you have to go through passport control/customs upon arrival at NRT and not to go through the transit area.
You can get a boarding pass for ET at the gate if you go through transit upon arrival at NRT. If you go through passport control/customs and come out at land side then get a boarding pass at check-in counter which is shown as opening three hours before the departure.