Letter from an Ageless Dream is designed for use with any system (including no system). Occasionally the adventure may allude to particular types of actions, levels of difficulty, or other mechanical components. When running the game, feel free to implement any die rolls, deck draws, or other randomizing actions you decide. Otherwise, feel free to simply respond to the players’ narrative actions for their characters and let them guide the adventure. (from the first page of the PDF)
This adventure was designed in 48 hours for the RPG Geek Adventure Design Contest 2013.