While still in university, she gained attention for starring in Nippon TV's talk program Koi no kara Sawagi.

[2] From October 2003 to September 2006, Kobayashi served as the weather caster for Fuji TV's Mezamashi Saturday.

In June 2004, Kobayashi made her acting debut as a flight attendant in the Fuji TV television drama Division 1: Pink Hip Girl.

[4][5] The couple registered their marriage on 3 March 2010 and held their wedding reception at The Prince Park Tower on 29 July 2010.

On 9 June 2016, her husband announced her condition at a press conference after the tabloid, Sports Hochi, ran a front-page scoop about her ordeal.