KO-D Openweight Championship
On October 7, 2015, Kodaka, along with five other former Union Pro wrestlers, announced the formation of a new promotion named Pro-Wrestling Basara, set to launch in January 2016. That same day, Kodaka won the 2015 Dramatic Sousenkyo, DDT's annual general election, to earn a shot at the KO-D Openweight Championship. In October, Yankii Nichokenju took part in All Japan Pro Wrestling'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. On November 1, Kodaka lost the Independent World Junior Heavyweight Championship to Shiori Asahi. 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. On November 28, Kodaka defeated Yukio Sakaguchi to win the KO-D Openweight Championship for the first time. After three successful defenses, he lost the title to Harashima on March 21, 2016, at . 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. 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. On December 25, Kodaka defeated Trans-Am★Hiroshi in a decision match to win the reactivated Union Max Championship. He lost the title to Fuma in his first defense on January 6, 2017. Two days later, Kodaka and Tsukamoto lost the NWA International Lightweight Tag Team Championship to Ryota Nakatsu and Ryuichi Sekine in their third defense. They regained the title on February 12. On March 2, Kodaka and Tsukamoto took the title back to Zero1, losing it to Koji Kanemoto and Minoru Tanaka.