… This is practically it.
Nope, it isn’t. It all goes generic, and even boringly peaceful until the Club Festival event. As the event approaches, things start to change for the darker and eerier. People fight more, and a certain someone gets depressed out of nowhere. At the end of the said event – no, even though I’m writing this as a spoiler, I won’t spoil everything: you gotta play this on your own! – there comes a point of no return; and after that… that’s when everything you have previously experienced as a cute little slice of life, becomes psychotically dark, uncanny and disturbing. As you keep playing, narrative, characters, environment, timeline… they all begin to get corrupted in one way or the other. If you persist in playing, you will soon discover that this game has a villain. A villain you have to deal with if you wish to save the others. [end spoiler first]
Oh, and as Monika recommends: save frequently!
[end spoiler second]