Hikaru Shida
On July 31, Tsukushi made her debut for DDT, taking part in an "Ice Ribbon offer match", where she and Maki Narumiya were defeated by Hikaru Shida and Neko Nitta. Tsukushi then went to form a tag team with former training partner and IW19 Championship rival Kurumi, with the two defeating Aki Shizuku and Hikari Minami, Maki Narumiya and Tsukasa Fujimoto, and Hikaru Shida and Neko Nitta in separate tag team matches to become the number one contenders to the International Ribbon Tag Team Championship. On August 12, Tsukushi and Kurumi made their debuts for Reina X World, defeating International Ribbon Tag Team Champion Neko Nitta and Reina World Tag Team Champion Hikaru Shida in a tag team match, with Tsukushi pinning Nitta for the win. On August 19, Tsukushi and Kurumi defeated Miyako Matsumoto and Neko Nitta to win the International Ribbon Tag Team Championship, starting Tsukushi's fourth reign with the title. On September 22, Tsukushi and Tsukasa Fujimoto took part in an event, which celebrated Manami Toyota's 25th anniversary in professional wrestling, teaming with Toyota in a six-woman tag team match, where they were defeated by Aja Kong, Kyoko Inoue and Tsubasa Kuragaki. The following day at "Ribbon no Kishitachi 2012", Tsukushi and Kurumi, with a combined age of 27, made their first successful defense of the International Ribbon Tag Team Championship against BBA38 (Cherry and Meari Naito), with a combined age of 76. Following the win, Tsukushi announced that she was studying English with a goal of defending the International Ribbon Tag Team Championship abroad. On October 8, Tsukushi and Kurumi formed the Seishun Midori stable with Aoi Kizuki. The stable wrestled their first match together on October 28 at "2012 Yokohama Ribbon III", defeating Maki Narumiya, Neko Nitta and Nozomi in a six-woman tag team match. On November 25 at "Nagoya Ribbon II – 2012", Tsukushi and Kurumi entered a one-day tag team tournament, where they were forced to put the International Ribbon Tag Team Championship on the line in all of their matches. They were, however, given a bye directly to the semifinals of the tournament. After defeating BBA38 in their semifinal match, Tsukushi and Kurumi lost the International Ribbon Tag Team Championship to Muscle Venus (Hikaru Shida and Tsukasa Fujimoto) in a final match, which was also contested for the Reina World Tag Team Championship. On December 31 at "RibbonMania 2012", Tsukushi and her other Seishun Midori partner, Aoi Kizuki, defeated Kyoko Kimura and Sayaka Obihiro to win not only the International Ribbon Tag Team Championship, but also the Reina World Tag Team Championship, a title owned by the Reina X World promotion. Starting her fifth reign, Tsukushi tied Emi Sakura's record for most reigns as the International Ribbon Tag Team Champion.