In Trapped in Mysterious Lewd Island, you wake up in a deep slumber on a mysterious island with a pretty girl next to you. You have no idea where you are or who the girl is. No one on the island knows how you got where you are. You learn that there's a competition that sometimes requires you to have sex. The winner is determined by how many points they earn. Play the game to the best of your ability by fucking these pretty ladies until they moan in pure delight. If you play the game right, you might discover who is behind sending you to this odd island.