LogFAQs > #888273958

Sure seems like so!

Well, here's some remaining mysteries to tide us over and my speculation.

#1. Who's Monika?
A sinister AI/god/the devil himself. a.k.a. 'The Literature Club in Don't Deal with the Devil!'
It's insidious how they design her to be the most interesting (and, arguably, attractive) girl. They lampshade it as well in dialogues, especially the one where you choose who to help during the festival preparation.
And her 'taking piano lessons'...yeah...I don't buy it.

#2. Can we save Sayori?
Probably not until the Golden Ending. Or we can but by sacrificing other people.

#3. Who else (other than Monika) is dangerous OR in danger?
Obviously, Yuri due to her fascination with knives, though that is very on-the-nose, so she might be a red herring.
Then, of course, me a.k.a. the main character. (I've also heard that the game can know our real name, but I already use my real name anyway. >_>). Playing with girl's feelings can end very badly.
Natsuki seems neither dangerous nor in danger so far...though she might be the target of Yuri's ire in some routes.

#4. What did Yuri write on the banner?
Probably something very heartwarming that'll only be revealed in the best ending. Otherwise, it might get corrupted and say something like "Die you fake mental bitch" >_>

#5. What'll happen on the second playthrough...and onwards?
We'll try to save Sayori but fails. Probably someone else will die.

At some point the fourth wall will disappear completely I think, with the main character getting full awareness of the situation....and Monika will address the player directly.
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Fuhlt nicht durch dich Sarastro Todesschmerzen,
So bist du meine Tochter nimmermehr-- eeeeeeeeeeeeeeehr.