Recently, Miki has been having trouble with her underwear being stolen by a thief, and when her neighbor's son (Satoshi) comes to deliver the neighborhood notice, she asks him to assemble a new one. While hanging out her laundry on the new one, Miki tells Satoshi about the underwear theft. When Satoshi responds to her story, Miki begins to suspect that Satoshi might be the culprit, and decides to find out.