In a world filled with powerful magic and wondrous technology, an unlikely band of adventurers including an assassin, a time traveler, a holy priestess, and an angel, seek to stop the opening of twelve demon doors. Each door owned by a demon as an entrance to the world of the living, each door's evil held back by the power of an angel. In their journey they cross space and time, the realms of science adn the realms of religion and fantasy. Should the company fail, their home shall plummet into the depths of hell itself.