Tetsuya is a rather ordinary Japanese teenager, who prefers hanging out with his sweetheart Rika than going to school. His passion are 3D video games. The newest game machine which allows the player to completely submerge into the virtual world, modeled according to his desires, has captured his heart. But one thing is strange: lately, Tetsuya keeps seeing himself as a killer and rapist. Dreams begin to haunt him. Is this just a side-effect of the game, or does he have a dark side he knows nothing about? Or maybe the game took him to another world, which will from now on become part of his life?..

The larger portion of Power Slave plays like a Japanese adventure, most of the gameplay being dedicated to choosing locations from the town map, triggering events and advancing the story. The omnipresent "Look - Talk - Move" menu appears at some locations. However, there are also several turn-based battles in the game. Those battles are always story-related, take place on an isometric screen, and are fought against a single enemy. Tetsuya can attack physically, defend, or spend two turns concentrating his spiritual energy in order to execute a special attack. The key to winning the battles lies in predicting the opponent's move, which can be deduced from their dialogue lines.

Power Slave has explicit sex scenes. Unlike in most other similar games, many of them are animated, using 2D anime-style graphics.

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