[18] On January 3, 2011, Kodaka won his first singles title and his first title in his home promotion of Union Pro, when he defeated Kim Nan Pun for the DDT Extreme Championship in a six-man tag team captain's fall match, where he, Keita Yano and Survival Tobita faced Nan Pun, Cao Zhang and Choun Shiryu.

[21] Kodaka regained the title from El Generico on January 3, 2012,[22][23][24] only to lose it to his own tag team partner, Yuko Miyamoto, on March 29 as part of an interpromotional rivalry between Union Pro and BJW.

[49] Six days later, Yankii Nichokenju lost the BJW Tag Team Championship to Twin Towers (Kohei Sato and Shuji Ishikawa), ending their eighteen-month reign at seventeen successful title defenses.

[54] On August 17 at Ryogoku Peter Pan 2014, Kodaka failed in his attempt to capture the KO-D Openweight Championship from Harashima in a three-way elimination match, which also included Kenny Omega.

[55][56] On August 24, Yankii Nichokenju lost the Wave Tag Team Championship to Sakuragohan (Kyusei Sakura Hirota and Mika Iida) in a three-way match, which also included Las Aventureras.

[57] Back in Union Pro on August 31, Kodaka and Fuma defeated Hiroshi Fukuda and Men's Teioh to win the UWA World Tag Team Championship.

[60] After finishing second in the Dramatic Sousenkyo ("general election"), Kodaka was granted another shot at the KO-D Openweight Championship, but was defeated by Harashima in the title match on October 26.

[63][64] On December 31, Yankii Nichokenju took part in Toshikoshi Puroresu, an annual new year's collaboration event between BJW, DDT and Kaientai Dojo, winning the Tenka Toitsu!

[65][66] On January 24, 2015, Kodaka and Fuma lost the UWA World Tag Team Championship to Masato Shibata and Shuji Ishikawa in their fourth defense.

The main event of the show saw Kodaka make his first successful defense of the Union Max Championship against Shuji Ishikawa, retiring the title immediately afterwards.

[81][82][83] In October, Yankii Nichokenju took part in All Japan Pro Wrestling (AJPW)'s Jr. Tag Battle of Glory, where they finished second with a record of two wins, one draw and one loss, suffered against Atsushi Aoki and Hikaru Sato in their last round-robin match, the de facto final of the tournament.

[86] On November 15, Kodaka and Miyamoto defeated Kotaro Suzuki and Yohei Nakajima in a decision match to win the vacant All Asia Tag Team Championship.

[90][91] After six successful title defenses, Kodaka and Miyamoto lost the All Asia Tag Team Championship to Atsushi Aoki and Hikaru Sato on July 24 at a BJW event.

[92][93] On November 30, Kodaka and Takumi Tsukamoto defeated Ikuto Hidaka and Hayato Fujita at a Basara event to win Pro Wrestling Zero1's NWA International Lightweight Tag Team Championship.

[97] Two days later, Kodaka and Tsukamoto lost the NWA International Lightweight Tag Team Championship to Ryota Nakatsu and Ryuichi Sekine in their third defense.

[103] Back in K-DOJO, Kodaka and Tank Nagai won the Strongest-K Tag Team Championship from Dinosaur Takuma and Kotaro Yoshino on November 12 and joined the Magatsuki stable.

[111] On July 21, despite a successful title defences against the Crazy Lovers, Yankii Nichokenju were forced to vacate the BJW Tag Team Championship after Miyamoto forgot to bring the belt to the event.

On September 21, Kodaka fractured his jaw during a cage match against Masashi Takeda; he would be out for over three months and would be forced to vacate the Zero1 junior heavyweight titles.

[114][115] He formed the Sento Minzoku stable with Ryuichi Sekine and Daiki Shimomura to feud with Sparky and Ganbare☆Pro Wrestling; their gimmick takes inspiration from Dragon Ball Z with each member growing a tail to signify their power.