Still working to get his wish complete, Watanuki finds himself into more mess than he can handle when certain facts about his everyday life gets revealed and when he needs to learn the lesson of Yuuko the hard way.

在沙漠城市玖楼国，少年小狼多年前，跟随养父考古家藤隆来到这国家，希望发掘该国的翼形遗迹，以解开玖楼国的历史之谜。小狼因此认识了玖楼国中的各人，包括与他青梅竹马的小樱公主。二人一直互相心仪，但小狼碍于身份问题，一直不敢表白。藤隆辞世后，小狼继承父亲遗志，继续挖掘和研究工作。为了拯救小樱，小狼带着小樱与新结识的法伊和黑钢踏上了在不同次元甚至不同时间寻找羽毛的征程，而飞王也在密切关注着事情的进展。只是主人公四人不会想到，这一切的一切，都是一个巨大的阴谋。

Invited to a wealthy client's mansion, time-traveling witch Yuko and her companions arrive to find a group of collectors assembled to participate in a mysterious auction. And the mystery only deepens when the collectors go missing one by one. As more guests disappear and strange occurrences abound, Yuko and her friends realize they must solve the mystery before they vanish as well.