The story in IV is a more character-focused tale centered around the lives of the chosen ones prior to and during their quest to prevent the resurrection of the ruler of evil, Estark. The first four chapters of the story are about the hero's companions and their own challenges and hardships. While they each travel with their own goals and dreams in mind, they all eventually discover the conspiracy of Psaro the Manslayer to drive the human race to extinction via Estark's hellish power. (https://dragon-quest.org/wiki/Dragon_Quest_IV:_Chapters_of_the_Chosen)
