From late May to early June, Kushida took part in the 2013 Best of the Super Juniors, where he managed to win four out of his eight matches with a loss to Kenny Omega in his final match on June 6 costing him a spot in the semifinals of the tournament. On June 22 at Dominion 6.22, Time Splitters failed in their attempt to regain the IWGP Junior Heavyweight Tag Team Championship from the Forever Hooligans. On July 18, American promotion Ring of Honor (ROH) announced that Kushida would be making his debut for the promotion on August 3 in Toronto, Canada. Kushida defeated Adam Page in his debut match for the promotion. Back in New Japan, Kushida and Shelley defeated Suzuki-gun (Taichi and Taka Michinoku) on September 29 at Destruction to earn another shot at the Forever Hooligans and the IWGP Junior Heavyweight Tag Team Championship. However, Time Splitters were forced to back out of the title match, after Shelley was sidelined with a back injury. Shelley returned from his injury on January 4, 2014, at Wrestle Kingdom 8 in Tokyo Dome, where the Time Splitters unsuccessfully challenged The Young Bucks for the IWGP Junior Heavyweight Tag Team Championship in a four-way match, which also included Forever Hooligans and Suzuki-gun. Time Splitters were victorious in a non-title rematch the following day, after which they asserted themselves as The Young Bucks' next challengers. They received their title shot on February 11 at The New Beginning in Osaka, but were again defeated by The Young Bucks. In March, Kushida took part in German promotion Westside Xtreme Wrestling's (wXw) 16 Carat Gold weekend. On April 12, during New Japan's trip to Taiwan, Kushida unsuccessfully challenged Tomohiro Ishii for the NEVER Openweight Championship. Time Splitters received another shot at the IWGP Junior Heavyweight Tag Team Championship on May 10 at Global Wars, a special event co-produced by NJPW and ROH in Toronto, but were defeated by The Young Bucks in a three-way match, also involving Forever Hooligans. At the second NJPW/ROH event, War of the Worlds on May 17, Kushida unsuccessfully challenged Jay Lethal for the ROH World Television Championship. On May 30, Kushida entered the 2014 Best of the Super Juniors tournament, where he won his block with a record of five wins and two losses, advancing to the semifinals. On June 8, Kushida defeated Taichi to advance to the finals of the tournament, where he was defeated by Ricochet. On June 21 at Dominion 6.21, Time Splitters defeated The Young Bucks to win the IWGP Junior Heavyweight Tag Team Championship for the second time. On July 4 at Kizuna Road 2014, Kushida became a double champion, when he defeated Kota Ibushi for the IWGP Junior Heavyweight Championship. On August 10, Time Splitters made their first successful defense of the IWGP Junior Heavyweight Tag Team Championship against the ROH tag team reDRagon (Bobby Fish and Kyle O'Reilly). On September 21 at Destruction in Kobe, Kushida lost the IWGP Junior Heavyweight Championship to Ryusuke Taguchi in his first defense. Two days later at Destruction in Okayama, Time Splitters made their second successful defense of the IWGP Junior Heavyweight Tag Team Championship against Suzuki-gun (El Desperado and Taichi). On October 13 at King of Pro-Wrestling, Time Splitters made their third successful title defense in a three-way match against Forever Hooligans and The Young Bucks. On November 8 at Power Struggle, Time Splitters lost the title to 2014 Super Jr. Tag Tournament winners reDRagon. On December 7, Kushida returned to ROH at Final Battle 2014, where he and Shelley unsuccessfully challenged reDRagon for the ROH World Tag Team Championship. Time Splitters received a rematch for the IWGP Junior Heavyweight Tag Team Championship on January 4, 2015, at Wrestle Kingdom 9 in Tokyo Dome, in a four-way match also involving Forever Hooligans and The Young Bucks, but were again defeated by reDRagon. On February 11 at The New Beginning in Osaka, Time Splitters received another title shot in a three-way match, but were this time defeated by The Young Bucks, who became the new champions.