Discord integration means that if you have "Show Game Activity" enabled on your Discord, then it shows a Rich Presence embed with information about your current playthrough, like how long you've been playing, where in the VN you are, which route you're on, etc. It's just a fun little extra. But I also know that some people don't want their Discord to show that they're playing a furry game, so I added the option to disable it, even though they could disable it directly on their Discord settings.
It looks like this:
