Ar nosurge is a 2014 role-playing video game for the PlayStation 3 developed by Gust. It is a continuation of Ciel nosurge released in 2012, and also a prequel to the Ar tonelico series. In AR NOSURGE: ODE TO AN UNBORN STAR, the player follows two sets of characters: Delta and Casty, whose goal is to protect humanity and save the world, and Ion & Earthes, who are trying to find Ion a way home to Earth. The player can interchange between both pairs and soon discover a way to combine their storylines and strengths to eventually solve the mystery that shrouds their ongoing struggle.