It's a drama CD translation. I guess I'm posting those here now.
01 - The Ivories of the Southern Sky, Chika and Kanan
02 - The Dazzling Lights of the Western Sky, Ruby and Dia
03 - The Hazards of the Eastern Sky, You and Yoshiko
04 - In the Distant Reaches of the Northern Sky, Riko and Mari and Hanamaru and...