Gatekeeper is a story of the greatest challenge to face the earth and how a young woman with the help of a strange man from the underworld find a slim chance to save the world. A mysterious and frightening man from the inner earth confides in a spoiled, naïve, young woman that the already damaged earth is probably doomed. He convinces her to enlist the support of her arrogant, manipulative, and powerful father. While running out of time, the three main characters must persuade the rest of the world of all the changes need to save it.