This date is listed as her official debut by not only the promotions she works for, but also by Nakagawa herself. The following year Nakagawa adopted the ring name Tomo Michinoku and aligned herself with Taka, with whom she would go on to win her first championship on June 4, 2006, when the two defeated Makoto Oishi and Shiori Asahi for the FMW/WEW Hardcore Tag Team Championship. They would hold the title for 34 days, before losing it to the team of Apple Miyuki and Yoshiya. The following December, Nakagawa dropped the Tomo Michinoku ring name and returned to wrestling under her real name. On April 15, 2007, Nakagawa announced that she was leaving Kaientai Dojo to become a freelancer on the Japanese independent circuit. Shortly after her departure from Kaientai Dojo, Nakagawa joined Mariko Yoshida's Ibuki promotion, where she also underwent further training under Yoshida. The following year Nakagawa became a true freelancer, when she left Ibuki and started working for promotions such as NEO Japan Ladies Pro Wrestling, Oz Academy and Pro Wrestling Wave. Nakagawa remained affiliated with Ibuki's production company, S Ovation, through which she, Hiroyo Matsumoto and Misaki Ohata produced their own independent events under the banner of "Joshi 4 Hope". Nakagawa made her debut for all-female promotion Oz Academy on March 9, 2008, in a tag team match, where she and Manami Toyota were defeated by Akino and Ran Yu-Yu. Shortly afterwards Nakagawa joined Mayumi Ozaki's villainous Ozaki-gun, before jumping to Aja Kong's Jungle Jack 21 stable on August 2, 2009. On April 10, 2011, Nakagawa and her Jungle Jack 21 stablemate and fellow Ibuki alum Hiroyo Matsumoto defeated Chikayo Nagashima and Sonoko Kato to win the Oz Academy Tag Team Championship. After a 77-day-long reign, the duo lost the title to Carlos Amano and Manami Toyota. The following September, the team was broken up, when Matsumoto jumped to Ozaki-gun and started a storyline rivalry with her former stablemates. In December 2012, Matsumoto returned to Jungle Jack 21, reforming her tag team with Nakagawa. On March 10, 2013, Nakagawa and Matsumoto defeated Mayumi Ozaki and Yumi Ohka to win the Oz Academy Tag Team Championship for the second time.