"Forgive me, Lord, for the tricks up my sleeves!" By day, Meimi Haneoka is an ordinary schoolgirl, struggling with boys and homework. But by night, she pulls off fantastic heists as the mysterious thief Saint Tail! With the guidance of her best friend, Seira, a nun-in-training, Saint Tail steals back treasures that are unjustly taken from the innocent. She is pursued by Asuka Jr., the son of a famous detective, who is determined to be the one to catch the thief. Where will Saint Tail strike next?