Chaos Wars (カオスウォーズ, Kaosu Wōzu) is a tactical role-playing video game developed and published by Idea Factory for the PlayStation 2.

[1] Chaos Wars is a crossover between several companies' role-playing video game series, including Aruze's Shadow Hearts, Atlus's Growlanser, Idea Factory's Blazing Souls, Spectral Souls: Resurrection of the Ethereal Empires, and RED Entertainment's Gungrave and Code of the Samurai.

[1] Hyoma, the protagonist, has a dream of another world over a pillar of light coming from his family shrine that has been missing since his ancestor's time.

During their investigation, they find a cave with strange technology but as they are looking into it, the machines activate and a bright light appears, taking them to another world known as Endia.

When Hyoma transports to the world, he encounters a girl named Rin, the Gatekeeper of Endia, who is surrounded by summoned monsters.