While the Chaos Rings series started on iOS, Square Enix is planning to publish the third entry as a retail Vita game alongside a smartphone release. To get Vita owners up to speed, Chaos Rings for PlayStation Mobile will be a free download between October 16 to October 21. The PlayStation Mobile version can be played on a Vita as well as certain Xperia smartphones.
As of now, this promotion will only be for Japan. Square Enix has not said if they will extend this to other regions and have not confirmed a Western release for Chaos Rings III on Vita.
Chaos Rings III: Prequel Trilogy comes out October 16. In addition to Chaos Rings III, this includes Chaos Rings, Chaos Rings II, and Chaos Rings Omega.
Chaos Rings III: Prequel Trilogy is a