A female classmate took the harmonica left by her father to a musical instrument store for tuning. Unexpectedly, the owner of the musical instrument store exchanged the tune with an ordinary harmonica for her, and even wanted to sell the harmonica for profit.The holy girl decided to retrieve the harmonica, so she chased it from the musical instrument store to the music competition venue.Finally, in addition to regaining the harmonica, it also enabled the owners of other musical instruments to recover their lost instruments.