故事发生在被“幽幻种”所入侵的世界里，唯有在巫女的祈祷下受到保护的浮游大陆“奥比耶‧克雷亚”，人类才得以生存。 欢迎。坠入秽歌之庭，接着上升回到浮游大陆之人啊，冻结千年的乐园在等待你。 舞台是唯一有人类居住的大地——浮游大陆奥比耶·克雷亚。 　　 距离这块浮游大陆高度一万公尺的下方，存在被称为「秽歌之庭」的「冰结镜面世界」。人类在害怕秽歌之庭的侵略下，提心吊胆地生活。 　　 关于在那样的世界里——支撑结界的少女与使用双剑的少年的故事。

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