I played this game for second time installing after long time and realised how much content it had within it like when i play again how sayori is missing and save files are gone. 

Also my god i just read the posts below and realised you can manipulate some files for different actions.

Originally i thought it was just something just a game with bugs or something strange. It is more than it. Also i am testing out by swapping files of the person in the characters folder.

hey , did you download it and play it through itch.io? ( not on steam) can you please tell me how to delete Monika? when sayori was deleted, her file stayed there , the files don't seem to be working. i don't think i can delete monikas file. can you please help me ?

yes i know that deleting sayori or any other person will not work manually but deleting monika will work. I tried it in the start of the game and in the end.