In April 2006, Mai Demizu joins TBS as announcer, synchronizing with Mayumi Mizuno and Ryusuke Ito.
On September 30 on same year, she making debut as announcer at a quiz show All-Star Thanksgiving, which she served as a break time promoter for the program.
On August 25 until September 2, 2007, she served as a reporter at 2007 World Championships in Athletics which held in Osaka, she supported and interviewed.
In March 2009, she became assistant on Discovery of the World's Mysteries, replacing Maya Kobayashi whom she left as TBS announcer.
On Autumn 2021, she is currently taking post-graduate college with the aim of obtaining a Master of Business Administration (MBA).