Mima Shimoda
In 2000, NEO Japan Ladies Pro-Wrestling began running shows regularly, starting with an event on May 31, where Tamura and Azumi Hyuga wrestled Misae Genki and Ran Yu-Yu to a thirty-minute time limit draw in the main event. In NEO, Tamura reinvented herself as "Tamura-sama", adopting the character of an arrogant villain. On August 24, Tamura represented NEO at a National Wrestling Alliance (NWA) event in Wildwood, New Jersey, United States, where she defeated Nicole Bass to become the inaugural NWA Women's Pacific Champion. The title was from the start unified with the NEO Single Championship and, although both championships were represented by their own belts, they remained together for their entire history. Tamura made her first title defense back in Japan on September 22, defeating Takako Inoue. Before the end of NEO's first year, Tamura also defended the titles against Misae Genki on October 13 and Kyoko Inoue on November 21. On February 11, 2001, Tamura lost the titles to Mima Shimoda in her fourth defense, ending her reign at 171 days. The following May, Tamura made it to the finals of the NEO Japan Cup, before losing to Misae Genki. On December 7, Tamura regained the NEO Single and NWA Women's Pacific Championships by defeating champion Lioness Asuka, Kyoko Inoue, Mima Shimoda, Misae Genki and Ran Yu-Yu in a six-way elimination match. After successful defenses against Misae Genki, Yuki Miyazaki and Kyoko Inoue, Tamura lost the titles to Etsuko Mita on April 13, 2002. However, the following month, Tamura defeated Mima Shimoda to win the 2002 NEO Japan Cup, which earned her another title shot on June 8, where Tamura defeated Mita to win the NEO Single and NWA Women's Pacific Championships for the third time. Tamura's third reign ended on October 14, 2002, when the HJPG (Horipro Joshi Puroresu Group) stable stole her belt, which was then declared vacant and put up for grabs in a tournament. On November 10, Tamura defeated Kyoko Inoue and Mima Shimoda in a three-way elimination tournament final match to win the vacant titles for the fourth time. On February 2, 2003, Tamura lost the titles to Inoue in her first defense, a Two Out of Three Falls match. Just three months later on May 5, Tamura defeated Azumi Hyuga to win the NEO Single and NWA Women's Pacific Championships for already the fifth time. In September, Tamura attempted to become a double champion, when she teamed with Ofune in the Itabashi Tag Team Championship tournament. Tamura and Ofune made it all the way to the finals of the tournament, before losing to the NEO Machineguns (Tanny Mouse and Yuki Miyazaki). Tamura's fifth NEO Single and NWA Women's Pacific Championship reign of 314 days ended on March 12, 2004, when she was defeated by Momoe Nakanishi.