很久以前，一只大灵狐被三槌家奉为守护神。其名为空幻，虽然它擅长各种法术头脑又聪明，却因为喜欢不停的捣蛋，最后被三槌家的祭司封印到了后山的祠堂中。时光流逝，到了现代，三槌家的末代子孙高上透梦见了女性的妖怪，透的母亲是三槌一族中本家的大巫，她从中发现了即将到来的危险，为了保护透，空幻作为他的守护神从封印中得以解放。不过被放出来的空幻却和人们传说中的大灵狐的印象大相径庭，是个平常在家中滚来滚去，还被透叫它“小空”的家伙。当化身为人类的时候，空幻就会变成绝世的美女，而且还可以男女互换！？而就是这样的空幻，以自己超凡的能力将逼近透的种种事件一一解决，自此空幻和透，还有透的哥哥升、三槌家的守护者——红纷纷被卷入，不可思议的的故事就这样开始了。
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