Yumiko Hotta
On January 6 at JWP's first event of 2013, Nakajima and Bolshoi lost the JWP Tag Team and Daily Sports Women's Tag Team Championships to Kayoko Haruyama and Tsubasa Kuragaki, with Haruyama pinning Nakajima for the win. On January 27, the storyline rivalry between HMK and JWP was blown off, when Hanako Nakamori, Kaori Yoneyama and Morii were defeated in a six-woman tag team match by Nakajima, Bolshoi and freelancer and AtoZ alum Kana, whom Nakajima had invited to the promotion, much to the dismay of Bolshoi. On February 17, Nakajima made her first successful defense of the JWP Openweight Championship against Kayoko Haruyama, avenging the pinfall loss from the tag team title match. In March, Nakajima and Bolshoi took part in the 2013 Tag League the Best, defeating Leon and Neko Nitta on March 3, before losing to Hanako Nakamori and Morii on March 31, as a result failing to qualify for the finals. On April 14, Nakajima defeated Yumiko Hotta in a No Holds Barred match for her second successful defense of the JWP Openweight Championship, avenging a tag team match loss against the World Woman Pro-Wrestling Diana representative from a month earlier. On April 25, Nakajima made her debut for Wrestling New Classic (WNC), taking part in a seven-way match for the WNC Women's Championship. The match, which also included Command Bolshoi, Kayoko Haruyama, Nikki Storm and Syuri, ended when Lin Byron pinned defending champion Makoto to become the new champion. On April 29, Nakajima took part in World Woman Pro-Wrestling Diana's second anniversary event, teaming with Command Bolshoi in a tag team match, where they defeated Megumi Yabushita and Piyota Mask. Later in the semi-main event, Nakajima interfered in a WWWD Tag Team Championship match, helping Keiko Aono and Yumiko Hotta defeat Kaoru Ito and Tomoko Watanabe for the title, aligning herself with Hotta's Bousou-gun stable and turning heel for the first time in her career. Back in JWP on May 5, Nakajima's friendship with Kana exploded into a storyline rivalry between the two, when Kana submitted Nakajima at the end of a heated tag team match. Post-match, Nakajima and Kana came to blows, before being separated by other JWP wrestlers. This new rivalry also led to matches between Nakajima and Kana in other promotions, including Osaka Pro Wrestling and Pro Wrestling Wave. In the latter promotion, Nakajima entered the 2013 Catch the Wave tournament on May 15, defeating Shuu Shibutani in her first round-robin match. Nakajima finished her round-robin block on June 19 with a record of two wins, three draws and one loss, suffered against Mio Shirai, and advanced to the knockout stage. On July 15, Nakajima first defeated Shuu Shibutani in her first round match and then Syuri in her semifinal match to advance to the finals of the 2013 Catch the Wave, where she was defeated by Misaki Ohata. Back in JWP on July 28, Nakajima defeated Command Bolshoi to not only make her third successful defense of the JWP Openweight Championship, but to also win the CMLL-Reina International Championship. On August 18, Nakajima lost the JWP Openweight Championship to Kana in her third title defense, ending her reign at 237 days.