国中生七梨太助孤单一人住在日本，母亲早逝，父亲是个狂热的考古学家，常年在中国发掘古迹，经常寄一些找到的古董回来（文物走私？）。这次寄来的是一个精美的圆环叫支天轮，居然从里面出来一个可爱的女孩。原来这个女孩叫小琳，是守护月天（月亮的精灵），只有心地善良的人才能把她从支天轮中召唤出来，然后她就会一直待在主人身边，依靠星神的力量保护他。但是小琳对现代社会一点也不了解，于是经常好心做坏事，例如把电视机打坏，在太助家门口设下无数陷阱，甚至认为太助在学校里遭到奴役而把太助的学校整个的拆掉了……
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