They use the ANA shared lounge post security but pre immigration. It's a decent lounge with nice views of the Tarmac. Bad wines, mediocre snacks. You need to give yourself 10-15 minutes to get through immigration and walk to the gate which can be at the end of the terminal (the last few flights I've taken out of there have used bus gates). They now have e-gates at immigration for both EU and non EU passports. That saved us (USA passport) about 10 minutes in line last week.