Revelations: The Demon Slayer, originally developed in Japan as Megami Tensei Gaiden: Last Bible, is the first game in the series. It was released for Game Boy on December 23, 1992 in Japan, for Game Gear on April 22, 1994 in Japan, and for Game Boy Color on March 19, 1999 in Japan and in August 1999 in North America. The game follows El, a boy who studies magic with his teacher Zodia