WARNING: Spoilers for ARAYA Chapter 8 and onward

At the end of Chapter 8, you will be given the decision to Kill or Spare Jit. If you elect to Spare Jit by pressing the E key, you will unlock the sequence for the secret ending when you escape from Araya at the end of the game. This is the only requirement to unlock the other ending for Araya and represents the best possible outcome for the story.

To see this in action, please view the below video: