If you delete sayori, you will get a hanging ending.

Wait for 10 minutes, and a message pops up.

If you deleted me before the game started [how could you?]you get the same ending.

:]

-M̛̩̺̩̜̼̓́̏̃OṄ͔͆͜Į̊K̛̖͈̺̘̜͎̺̳̻͛̄́̌͗̆͘͝A̝̮̽̃̕͢