[7] Also in 2006, Takanashi made his debut for El Dorado Wrestling, where he worked alongside his Último Dragón Gym training partners as King Pocota.

[7] On November 23, Takanashi won his first major title, when he and Seiya Morohashi defeated Francesco Togo and Mori Bernard for the KO-D Tag Team Championship.

[28] After returning to performing as Masa Takanashi, he defeated Danshoku Dino and Kudo in a three-way match on February 20, 2008, to win the DDT Extreme Championship.

[35] On November 29, Takanashi, Dino and Hikaru Sato defeated the Italian Four Horsemen (Antonio Honda, Francesco Togo and Piza Michinoku) to become the first DDT-promoted UWA World Trios Champions.

[37] On March 14, Takanashi won a fifteen-man battle royal to become the number one contender to DDT's top title, the KO-D Openweight Championship.

[39] He would lose the title to Danshoku Dino six days later in a four-way match, which also included fellow Belt Hunter×Hunter members Hikaru Sato and Keisuke Ishii.

[40] Takanashi received his shot at the KO-D Openweight Championship on April 4, but was defeated by defending champion Daisuke Sekimoto, who outweighed him by 50 kg (110 lb).

[51] On October 23, Takanashi won a sixteen-person rock-paper-scissors tournament to become the number one contender to the KO-D Openweight Championship, but would be defeated in the title match on November 6 by the defending champion, Kudo.

[57] After leading fellow DDT Seikigun members Daisuke Sasaki and Harashima to a six-man tag team victory over Homoiro Clover Z on March 11, the stable's leader, the reigning KO-D Openweight Champion Danshoku Dino, named Takanashi and Sanshiro Takagi his top two contenders for the title.

[63][64] On June 24, Takanashi and Daisuke Sasaki received a shot at the KO-D Tag Team Championship, but were defeated by the defending champions, Homoiro Clover Z representatives Kudo and Makoto Oishi.

[68] Later that same day, Takanashi made a special appearance for Pro Wrestling Noah, facing former training partner Taiji Ishimori in a losing effort.

[69] On August 18 at DDT's 15th anniversary event in Nippon Budokan, Takanashi, Daisuke Sasaki, Hoshitango, Tetsuya Endo and Tsukasa Fujimoto, representing Familia, defeated Antonio Honda, Tanomusaku Toba, Yasu Urano, Yoshiko and Yuji Hino, representing Crying Wolf, in a ten-person tag team match, contested under "Soccer rules".

Following the match, Honda announced that he, Hoshitango, Sasaki and Hino were reforming the Monster Army, claiming that Takanashi and Urano were the ones who ruined the original stable.

[76] Ten days later, Takanashi took part in a nine-man battle royal, during which he won the Ironman Heavymetalweight Championship from Gorgeous Matsuno for the twelfth time, only to lose it to Tomomitsu Matsunaga nine seconds later.

[77][78] Takanashi then resumed his rivalry with his former Monster Army stablemates,[79] which built to an eight-man tag team match on August 17, during the first day of DDT's 16th anniversary weekend in Ryōgoku Kokugikan, where he, Akito, Kazuki Hirata and Yukio Sakaguchi defeated Antonio Honda, Daisuke Sasaki, Hoshitango and Yuji Hino.

[86][87] Following the main event, Takanashi came out to challenge Harashima for the KO-D Openweight Championship, but was then surprised by Urano, who pinned him to become the new Ironman Heavymetalweight Champion.

[98] The first title match took place on May 4 and saw Shuten-dōji defeat Daisuke Sasaki, Kenny Omega and Kota Ibushi to capture the KO-D 6-Man Tag Team Championship.

[101] On June 8, Shuten-dōji made their first successful defense of the KO-D 6-Man Tag Team Championship against Smile Squash (Akito, Harashima and Yasu Urano).

[103] Shuten-dōji, however, regained the title from Happy Motel just seven days later in a three-way match, which also included Team Drift (Keisuke Ishii, Shigehiro Irie and Soma Takao).

[115][116] On January 3, 2016, Takanashi was named the number one contender to the KO-D Openweight Championship, after pinning Harashima in a six-man tag team match.

[121] On December 11, Takanashi, Kudo and Sakaguchi defeated Damnation (Daisuke Sasaki, Mad Paulie and Tetsuya Endo) to win the KO-D 6-Man Tag Team Championship for the fifth time.

[122] They lost the title to Kazusada Higuchi, Kouki Iwasaki and Mizuki Watase in a three-way match, also involving Antonio Honda, Konosuke Takeshita and Trans-Am★Hiroshi, on January 22, 2017.

[123] Takanashi, Kudo and Sakaguchi won the KO-D 6-Man Tag Team Championship for a record-tying sixth time on June 25, 2017, by defeating NωA (Makoto Oishi, Mao and Shunma Katsumata).

[131] After recovering from his ACL injury, Takanashi, still unable to wrestle, returned to Ice Ribbon on June 15, 2011, losing the Ironman Heavymetalweight Championship to Emi Sakura.