From the introduction:
Alien Passion Disaster (APD) is a role playing game of discovery, interaction, conviction, passion, conflict and xenodiplomacy in an open universe from three to five players.
Each player will play the role of a race, one of their factions or even a single character. This game can be played in a single session as a whole, as the previous step to set up any scenario for other purposes or like a traditional RPG.
There’s not just one Game master, each player will participate with their narratives and decisions to construct the full history from the initial set-up to the standard game.