Although it features its own cast of unique characters, Chaos Wars also features characters from several other games including Growlanser, Shadow Hearts, Gungrave and Spectral Force. The story centers on Hyouma, a student who is too curious for his own good. Despite several warnings, he decides to take a group of friends to explore a cave that keeps popping up in his dreams. While exploring the cave, Hyouma and his friends are transported to the world of Endia where he befriends a girl named Rin. After a quick battle, Rin explains that she has the ability to teleport people from different dimensions.