So, I think you already know this, but... we broke your game quite a bit. Lots of bugs, multiple soft locks, the no returns are potential hardlocks (you want to have your player save before entering regardless of their choice and disable saves in the areas that can cause a hardlock). I recommend you also add a save point before choosing your character.
Definitely rebalance your skills. Most of them are extremely weak except for that one combo I was using and the heals, which were really powerful and far beyond what you need for the game. You did also have that one skill that heals instead of dealing damage and can be used outside of battle.
Definitely double check your events and switches. I looked at your things and you don't need to have both a switch and a key item both activated. You can use either instead of both. Also, the reason why the problem happens is the exit from the city to the forest turns on the messenger switch.