this is about what date Psyche deterioration happened, its confirm in Psyche anecdote :
More accurately, it happened on November 22nd at around 2 AM :
So, the small mistake is the month, because the first time we see Fina, Outsider come home early and bring her cake, because it's her birthday :
but Fina birthday is on April 2nd :
Ellume
Maybe they should add a replay option for story chapters so people can go back to try things again