I was out of healing items and SP about when you need to clear the area near the very beginning, did not try the pig's drug, decided "screw it, I can't progress it, let some of them defeated me to see what would happen, straight up booted to the main menu, not evem\n a "they captured you for evil reasons" flavor text, what did I miss?
I think you probably ended up doing that first bit in a sequence I wasn't anticipating. But if you get all the items in the office and in the warehouse, you should have plenty to deal with both the encounter in the warehouse and the boars you need to defeat outside, at least to get the key. Remember you can heal via skill when out of combat, you don't have to use an item.
Also if it helps, the boar with the key isn't randomized, it's the same one each time. So if nothing else you should be able to save-scum until you hit the right one. With the above though, hopefully that won't be needed.