A 14-year-old girl becomes a phantom thief by night, stealing from thieves to return what was lost, and her classmate is the only one who can catch her. The romance isn't a subplot waiting to happen, it's built into the fundamental tension of the show, two people on opposite sides of the law who keep almost recognizing each other. This is a magical girl show that treats the heist itself as the magic, not a transformation sequence.
Meimi Haneoka lives a double life. By day, she's an ordinary eighth grader juggling homework and crushes. By night, she becomes Saint Tail, a phantom thief with a Robin Hood complex who breaks into crime scenes to reclaim stolen goods and return them to their rightful owners. Her best friend Seira, a nun-in-training with genuine magical abilities, helps plan each heist, while the determined detective Asuka Jr. becomes increasingly obsessed with catching the mysterious thief he can't quite pin down, not knowing she sits right next to him in class. What starts as simple vigilante justice grows more complicated as Asuka Jr. gets closer to the truth and Meimi's feelings for him become harder to ignore. The tension between maintaining her secret and wanting him to know the real her drives everything forward. It's a romantic caper that balances the thrill of midnight thefts with the vulnerability of teenage crushes, where Meimi has to decide how much of herself she can risk revealing without losing everything.