Upon turning thirteen, Asuka and Kei learn their family is part of a worldwide network of righteous vigilantes, and now they will join the ranks of phantom thieves.
Asuka Kouzuki is just a normal twelve-year-old girl on spring breakuntil she learns shes from a long line of phantom thieves! For generations, her family has been stealing from bad guys and helping others, and her dad has been secretly teaching her the skills for the job her whole life. Now that shes about to turn thirteen, its time for her to take on the role alongside her cousin Kei, a genius with an IQ of 200. Thanks to her superhuman athletic abilities and his smarts, no ill-gotten treasure is safeat least, if they can get along!