[2][3][4] Kodera debuted in mixed martial arts on November 9, 2002 (2002-11-09), defeating Nana Ichikawa by armbar submission at Smackgirl - Japan Cup 2002 Episode 2.
[5] In her next fight, almost two years later, she was defeated by rear naked choke by Mari Kaneko at Golden Muscle - Strongest Queen Tournament on May 7, 2004 (2004-05-07).
[6] Three years later, Kodera fought and defeated Mamiko Mizoguchi by armbar at Kingdom of Grapple - Live 2007 on November 25, 2007 (2007-11-25).
[7] Kodera would return to Smackgirl, losing against Masako Yoshida by unanimous decision.
[10] Kodera would then participate in the 2009 Rough Stone Grand Prix 48 kg tournament, defeating Misaki Ozawa by submission (armbar) on September 13, 2009 (2009-09-13)[11] and Kikuyo Ishikawa by decision (unanimous) on December 11, 2009 (2009-12-11) to win the tournament.