Teacher Yuan is really strange, why did he give us those strange keys? What else can I say, that key will open the door to my destiny... But then, something even stranger happened... My friends Bingting, Xiao Mo, and three other boys I just met were drawn into a strange place by a book. The people here actually use magic? ! They say that people from other worlds will come here to save their king, and those people are us... If we can't save the king, we can't return to our world. To this end, we embarked on a strange adventure...