Attention²: The patch is for Saeki and James event 5 (Halloween) routes. I didn't made it for the other characters.
So here's the solution to solve all your problems while needing a guide to do events - patch the game script! It's something very easy to do and should grant you access to whichever ending you want to achieve without actually needing a guide.
Please note that, while the patch allows for an easier path in order to reach the desired ending, it still needs the truckload amount of Gold in order to pass the chapter missions, so this isn't exactly cheating - I am just facilitating event completion for foreign users... ;Orz
Patch download link and detailed how-to can be found just below, in the full post:
