In the abyss of black and white, there is a cat spirit and a fox spirit. They have been practicing for a billion years, and finally they have ten tails, and they can finally turn into human form. At this time, the sworn enemy of their demon sect, the strange god sect, provoked them, triggering a war, although the demon sect won. , However, the magic weapon of their Demon Spirit Sect, the Demon Spirit Mirror, was broken into several parts and scattered in the world. Under the guidance of the Demon Spirit Fairy, they traveled through the world and retrieved the fragments of the mirror. During this time, they met a group of passionate teenagers who loved tennis and were persistent in their feelings. However, everything would have to happen again. . .