Utawarerumono: Tusukuru-koujo no Karei Naru Hibi

うたわれるもの トゥスクル皇女の華麗なる日々

Included with the premium collection release of the PS4 remake of Utawarerumono: Chiriyukumono e no Komoriuta. The anime will tell the story of Kuon's childhood days. (Source: ANN)