The local council in Kakogawa placed a piano inside the area's main railway station in November.
Authorities hoped residents would respond to a global trend that has seen a huge rise in street pianos.
But officials were disappointed by apparent rule-breaking, such as people playing for too long or singing.
In law-abiding Japan, some directives were laid out for the piano's use. Officials insisted that users should disinfect their hands before playing, that performances should be kept to 10 minutes and that people should avoid voice accompaniment.