The 44-year-old woman, identified as Tomomi Monmae in a Kotaku article, dialed 110, the Japanese version of 911, repeatedly from May to November.
City authorities said in one instance, she called over 900 times in a single day.
"She made as many as 927 emergency calls in one day....disturbing our police duties," said a Sakai city official. Sakai is about 10 miles south of Osaka.
Police visited Monmae at home over sixty times to get her to stop calling. She was finally arrested this week for "interfering with police duties," Kotaku reported.
As for the content of the calls, city authorities said there were no actual emergencies to respond to. Kotaku reported that the calls consisted of requests to arrest acquaintances, or were simply hangups.
"She didn't make up a story that required us to respond -- it was just total nonsense," the official told AFP.
According to AFP, Monmae was charged with fraudulent obstruction of police business, for which she could spend up to three years in prison or be fined 500,000 yen ($4,900).