The year is 3001. Mankind has conquered the galaxy and established an alliance to protect peace in the known space. The galactic federation of the ninth planet sends a man into deep space on a confidential operation known as "Abyss". However, the commander is captured by a criminal syndicate. His memory is erased, and he is rendered unable to communicate with his allies. His goal is to escape and find a way to return to the mother ship. Abyss is a text adventure with graphics. The player must input combinations of verb commands and objects in order to communicate with the environment and use inventory items to solve puzzles. Though the text descriptions are in Japanese, the commands themselves are in English.