Riko Rinda is an appraiser with her own store "All-Around Appraiser Q". She is hired as a temporary employee by The Louvre for a Mona Lisa exhibition to be held in Japan. Yuto Ogasawara is a magazine editor and follows Riko Rinda for a story. The two soon discover a hidden puzzle of the Mona Lisa. ~~ Based on the novel "Case Files of All-Round Appraiser Q IX" by Keisuke Matsuoka.