During the American trip, Kushida also formed a new partnership with Alex Shelley, saving him from IWGP Junior Heavyweight Tag Team Champions, Forever Hooligans of Alex Koslov and Rocky Romero.
On September 7, Kushida took on Ibushi in a match for the IWGP Junior Heavyweight Championship and lost.
On October 8 at King of Pro-Wrestling, Kushida and Alex Shelley unsuccessfully challenged Forever Hooligans for the IWGP Junior Heavyweight Tag Team Championship.
On October 21, the Time Splitters entered the 2012 Super Jr. Tag Tournament, defeating Jado & Gedo in their first round match.
On November 2, Kushida and Shelley defeated Suzuki-gun (Taichi and Taka Michinoku) to advance to the finals, where, later that same day, they defeated Apollo 55 (Prince Devitt and Ryusuke Taguchi) to win the tournament and become the number one contenders to the IWGP Junior Heavyweight Tag Team Championship.
On November 11 at Power Struggle, the Time Splitters defeated Forever Hooligans in a rematch to win the IWGP Junior Heavyweight Tag Team Championship, Kushida's first title in New Japan.
On November 15, Kushida participated in the NEVER Openweight Championship tournament and was eliminated by Masato Tanaka.
Time Splitters made their first successful title defense on February 10, 2013, at The New Beginning, defeating Forever Hooligans in the third title match between the two teams.
Their second successful defense took place on March 3 at New Japan's 41st anniversary event, where they defeated Jyushin Thunder Liger and Tiger Mask IV.

On April 7 at Invasion Attack, Time Splitters defeated Apollo 55 for their third successful title defense.
On May 3 at Wrestling Dontaku 2013, Time Splitters lost the IWGP Junior Heavyweight Tag Team Championship back to the Forever Hooligans in their fourth defense.

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
During the American trip, Kushida also formed a new partnership with Alex Shelley, saving him from IWGP Junior Heavyweight Tag Team Champions, Forever Hooligans of Alex Koslov and Rocky Romero. On September 7, Kushida took on Ibushi in a match for the IWGP Junior Heavyweight Championship and lost. On October 8 at King of Pro-Wrestling, Kushida and Alex Shelley unsuccessfully challenged Forever Hooligans for the IWGP Junior Heavyweight Tag Team Championship. On October 21, the Time Splitters entered the 2012 Super Jr. Tag Tournament, defeating Jado & Gedo in their first round match. On November 2, Kushida and Shelley defeated Suzuki-gun (Taichi and Taka Michinoku) to advance to the finals, where, later that same day, they defeated Apollo 55 (Prince Devitt and Ryusuke Taguchi) to win the tournament and become the number one contenders to the IWGP Junior Heavyweight Tag Team Championship. On November 11 at Power Struggle, the Time Splitters defeated Forever Hooligans in a rematch to win the IWGP Junior Heavyweight Tag Team Championship, Kushida's first title in New Japan. On November 15, Kushida participated in the NEVER Openweight Championship tournament and was eliminated by Masato Tanaka. Time Splitters made their first successful title defense on February 10, 2013, at The New Beginning, defeating Forever Hooligans in the third title match between the two teams. Their second successful defense took place on March 3 at New Japan's 41st anniversary event, where they defeated Jyushin Thunder Liger and Tiger Mask IV.
On April 7 at Invasion Attack, Time Splitters defeated Apollo 55 for their third successful title defense. On May 3 at Wrestling Dontaku 2013, Time Splitters lost the IWGP Junior Heavyweight Tag Team Championship back to the Forever Hooligans in their fourth defense.
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 
Yujiro Kushida