Upon the broadcast of final episode of ChäoS;Child, it was announced that its true end from the visual novel Silent Sky will get an unaired episode. The official website indicates that the detail will be announced at a later time.
The visual novel is the fourth series in 5pb.’s sci-fi adventure franchise, which also includes Steins;Gate and Robotics;Notes. ChäoS;Child is the sequel game to ChäoS;HEAd, which was developed with Nitro+ and initially released in August 2008. ChäoS;HEAd was also adapted into a TV anime in Fall 2008. ChäoS;Child TV anime aired in Winter 2017.