transiting Airport: NRT
Arriving Airline: NH
Departing Airline: UA
Connection Time: 9 hours (7:55am to 5:00pm)
Connecting: Int - Int
Booked via: Single Ticket

Having connected in NRT a million times I know the deal, but pretty much what I wanted to do is transit back into the terminal after clearing security to goto the ANA or UA lounge to shower and change then exit the terminal and clear customs to go into Tokyo for a quick lunch. I don't know the process of trying to leave the terminal to get into customs so I appreciate any advice.