The new client is a fairy...!? We intend to investigate the mysterious creatures known as the Damedame... But where are we? One day, a rumour is spread around the town about an "X Mark Incident"! When something valuable is marked with an X, it stops working or becomes unusable, causing trouble for everyone... As Anna and her friends investigate this "X Mark Incident", a fairy client known as Rain appears. His request is to "protect Karin from the Damedame"! Rain leads them to a place as beautiful as a dream: "Karin's Garden". There, they meet a girl named Karin, and a fairy named Alan who watches over her. Alan and Rain seem to care deeply for Karin. Anna and the others become friends with Karin and immediately begin their investigation! However! Suddenly, the Damedame appear even in the peaceful garden... What exactly are the Damedame!? What is the secret hidden in this mysterious garden...?