Kusakabe Ai is Kaitou Jeanne. After two years of not being a Kaitou, her good friend Angel Fei suddenly told her in her senior year of high school that after the last battle, the Demon King was unwilling and released a large number of demons in another time and space. The people there suffered greatly, so God sent her to become a Kaitou again, travel through time and space, and destroy those demons. It happened that she and Nagoya Zakora were in the cold war, so she and Fei embarked on a new journey alone, where she met the magician under the moonlight - Kaitou Kidd.
PS: The plot in this article is different from the ending of the comic. Fei is not dead. Those who like the ending of the original comic should be careful.