Game process ARMAGON 2069 combines elements of a roguelike and a text-based visual novel. The action takes place in a parallel universe in the distant future, when humanity has achieved many technological breakthroughs. In addition to humans, the world is inhabited by other intelligent beings, monsters that can disguise themselves as humans. However, their intentions are extremely cruel and aggressive – they came to Earth to rape and kill their victims.

For over several hundred years, an enemy intelligent civilization has terrorized the human population, and now it's time for payback. The main character is a member of the Argon Explorers order. The members of this faction fight together with their opponents and gradually drive them out of their world. They have learned to track down monsters' disguises, and their combat abilities allow them to destroy anyone who stands in their way.

For years, the order tracked down monsters and eliminated them. Over a long period of time, they managed to kill thousands of monsters, seeking the truth of their origin and the real purpose of being on Earth. The gameplay features erotic scenes that appear depending on the user's success in making choices. The gamer's actions affect the further progress of the plot. The central character in the passage will repeatedly encounter opponents and will participate in spectacular battles, using futuristic weapons.