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To return back without worrying about the FOEs in the previous room, there will be a one-way shortcut right next to the event with the Snuff Soul.
Ignore it for now and go to the nearby dead end for an event, where if you let Koromaru be, he will get you a Battle Leotard.
The north end one leads to an area with a Power Spot, shortcut back to the beginning area and another room that is empty (it's for a request later on).
Go back and head through the other door mentioned to be presented with Destined Partner Quest #5, so answer it and continue forward.
Just past the FOE is a small alcove, where you'll find a doll.
Inspect it and then ignore it for now, going through the door to view a short scene (shortcut right by the door).There will be another FOE here, facing west, which is blocking your path, so you'll need to find a way to get it to move.