Kyoka, a "shoplifting detective," has been offered a new job at an ordinary convenience store in a certain prefecture. After hearing the characteristics of the thief from the store manager, Kyoka immediately sets her eyes on the store. After waiting for a few hours, the thief visits the store. Kyoka then catches the moment of the crime and calls out to the thief as he leaves the store, but... "I bought this at another store," he says, showing her the receipt from the other store, and Kyoka realizes the mistake she made. And the price of that mistake is too high...