Square Enix have announced Chaos Rings Omega is out now on Android devices, iPhone and iPad. Chaos Rings Omega is a prequel to Chaos Rings, set 10,000 years before, but still takes place in the Arc Arena. you play as Vieg and play through battles and uncover stories related to Chaos Rings. the game is out now on Google Play for $12.99/£8.99/€10.49, or you can get the iPhone version for £7.99 or the iPad version for £10.49.
I have included a trailer for the game that shows in-game action from character interaction to battles, but it is in Japanese.
Source: Square Enix Blog