On April 13, 2008, Kamimura was named the MVP of the J-Grow 20 Amateur Tournament with her victory over Madoka Jinnai.
[3] Kamimura won the tournament, finishing her first two opponents and defeating Seo Hee Ham in the final match by decision.
[10] She next faced Lomar Lookboonmee for the vacant WPMF World Women's Mini Flyweight (-47.7 kg/105 lb) Championship at RISE/M-1 ~Infinity~ in Tokyo on December 2, 2012.
[12][13] Kamimura retained her WPMF title by defeating Churi Gothawynjim at M-FIGHT SUK WEERASAKRECK II Part.1 on June 16, 2013.
[16][17] In August, 2014 Kamimura retired from competition citing an unspecified incurable condition that was aggravated by the physical and mental stress of fighting.