故事背景在剧场版《苍穹之法芙娜 HEAVEN AND EARTH》的2年后，由于与来主操的邂逅，龙宫岛获得了与Mir对话的手段，这也给岛带来了可能性。阿尔维斯的孩子们一边进行战斗的准备，一边摸索着理解敌人的方法。2年后的现在，龙宫岛获得了更进一步的进化，理解Festum语言的少女与被Festum所守护的少女，当两人相遇之时，新世界的门将打开……收起
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