To fully restart the game:

• Go to the Episodes menu (it is easily identifiable by its circular arrow). There, you should find an option to restart your game progress. 
• Confirm your choice to begin a new game from the start.

Fully restarting the game means beginning a new game session from scratch. All your previous progress, including character relationships, unlocked secrets, and special photos, will be permanently deleted.

You will need to create a new avatar and start the storyline anew. However, your unlocked Photos will remain unlocked. Once reset, the previous progress cannot be recovered.