Tsukiji Hongwanji: Shelter Ruins
Go north, then west past the fork. Continue along to the end of the path where you can break down some wormwood and open a chest with a St Incense inside. Backtrack to the previous fork and go north and up the ladder.
Continue along the path and you'll soon reach a north/west fork. Go west and along the path to find a Summon Stone at the end. Break down the wormwood nearby and backtrack to the previous fork. Again go north and up the ladder.
Continue along the linear path to a north/south fork. Go south to break some wormwood and get the useful Bead Chain . Then go north and through the door, then opt to go to the main building. Go through the portal nearby and head outside.
Tokyo Overworld Map & Ginza
Return inside Ginza and, there, head north to meet Walter and Hikaru briefly. Hikaru will mention meeting with Fujiwara in Shinjuku to get under the Roppongi building. You'll get a Matchbox to signify that you are a member of the Florida cafe.
Anyways, in Ginza, stock up. For now, we're going to sidetrack into downtown Ginza; there are some quests we'll then cover under the Ginza Quest Cleanup. Otherwise, continue on to The True Face of Evil (Part 2).