To be honest, don't really know how to do that. I can maybe share a save file that puts you at the beginning of the Liberation path or just send a save with everything unlocked and you can watch the true ending (though to be honest if you haven't played through to get it, it probably going to be very confusing and random.)
If you want to unlock the liberation path yourself I can tell you. You have to do all four of the miko dance training events with the priest on Saturdays. Doing all so will unlock addition scenes to the festival ending. Watching the ending play out will give you a prompt to let you onto the True Ending path. From there just talk to the NPCs in the abandon factory and they will set you on where to go.
(To speed things up, use the Long Novel that can be purchased on the computer in the apartment. When you have it, you can use it to skip days for how long you want. I'd use it to just skip to every saturday and then just skipped straight to the end of the summer to go to the festival ending.)
