第9話: セツナは氷に閉ざされた地下シェルター都市で、リンネの謎の発明を手伝う。
2018年8月26日 放送
In an underground shelter-city encased in ice, Setsuna meets a young girl named Rinne and begins helping her with a mysterious invention. It can apparently help save the world, but its true nature is unclear. Meanwhile, the city itself will very soon perish. (Source: Crunchyroll)