Demon Life - My Harem is a role-playing game in which the player plays the role of a demon prince. He is the leader of a group of demon princes and must rule the world. He will be able to build his own harem and take a variety of different beauties as his wife. The player can do whatever he wants, he is the master of his destiny.

The world is an open sandbox in which the player is free to do whatever he wants. He can go to the city, the country, the desert, the forest, the ice-cold mountains, etc. He can find whatever he wants in the world and do whatever he wants.