This article is a time-travel story. The female protagonist is a lawyer in this world who time-travels into the body of a 10-year-old girl after an accidental death. In a coincidence, she helps a nine-tailed fox over 9,000 years old survive its last and biggest disaster. In order to repay the girl, Kyuubi gave her one of his tails. The girl herself is a person with strong spiritual power. The power of the fox demon cannot be combined with the girl's spiritual power, so this tail is of no use to the girl. Once, when the girl returned to Japan from abroad with her parents, she discovered that she had traveled to Yubai's world. The girl who has always been afraid of trouble has been careful not to have any interaction with the protagonist Youbai in the spirit of a passerby. But it is better to calculate than to calculate. The girl found out that the middle school she transferred to was actually Union King Middle School. Oh my God, it couldn't be like this. I asked the heavens speechlessly. From then on, the adventure of the girl Qianxun began.