Monika: "You know what I know, that this is JUST A GAME." (Or something like that.)
To a true gamer, nothing is ever "JUST A GAME", you become the character you play, you feel connected to the world you get to visit. And your character's life is your life.
So if I seem different to anyone, this didn't start until I finished that game and the images haunted me, blame it on the game.