These games actually have so much in common it’s kinda crazy- TW for Five pebbles and Sunny (in the game) both want to do an action involving to ‘make damage to ones body or emotional state with purpose’ I can’t say the word but if you are aware of what rain world or Omori is then this is not new to you.
First two characters are Mari and Looks to the moon (older sisters) Second ones are Sunny and Five pebbles (Younger brothers)