Due to the destruction of nature by humans, many fairies have lost their homes. Xiao Hei, a black cat fairy who has lost her place due to the development of the forest. The one who reached out to him was the same fairy Fusi. Huxi joins Xiaohei in her company and guides her to a remote island where she lives. Mugen, the strongest executioner who is human, appears on the island. He sensed the disturbing movements of the Huthi and came to capture them. During the battle, Xiaohei is captured by Mugen. The Huxi who managed to escape have vowed to recapture Xiao Hei and begin a "strategy" that they have been planning for some time. On the other hand, Mugen and Xiaohei aim for a hall where fairies coexist with humans. Will Xiaohei find a new home? And what will be the future of humans and fairies?