The following champion history features the Strongest-K Championship.
Title history[]
| # | Wrestler | Reign | Date | Location | Notes |
|---|---|---|---|---|---|
| 1 | Hi69 | 1 | July 3, 2004 | Aqua City, Odaiba | Hi69 defeated Kengo Mashimo in the finals of a 16-man tournament to become the first champion. |
| 2 | Kaz Hayashi | 1 | September 11, 2004 | Tokyo, Japan | |
| 3 | Taka Michinoku | 1 | January 10, 2005 | Tokyo, Japan | This match was also contested for the World Junior Heavyweight Championship. |
| 4 | JOE | 1 | January 6, 2006 | Tokyo, Japan | |
| 5 | Kengo Mashimo | 1 | October 9, 2006 | Tokyo, Japan | |
| 6 | Yuji Hino | 1 | April 13, 2008 | Tokyo, Japan | |
| 7 | Kengo Mashimo | 2 | August 9, 2008 | Chiba, Japan | |
| 8 | TAKA Michinoku | 2 | April 12, 2009 | Chiba, Japan | |
| 9 | KAZMA | 1 | October 18, 2009 | Chiba, Japan | |
| 10 | Yuji Hino | 2 | August 15, 2010 | Chiba, Japan | |
| 11 | Kengo Mashimo | 3 | June 18, 2011 | Tokyo, Japan | |
| 12 | Daisuke Sekimoto | 1 | August 22, 2012 | Tokyo, Japan | |
| 13 | Yuji Hino | 3 | November 13, 2012 | Tokyo, Japan | |
| 14 | Taishi Takizawa | 1 | April 14, 2013 | Tokyo, Japan | |
| / | Vacated | N/A | July 2, 2013 | Chiba, Japan | The title was vacated after Takizawa was arrested for voyeurism. |
| 15 | Kengo Mashimo | 4 | September 1, 2013 | Chiba, Japan | Defeated Ryuichi Sekine in the finals of a tournament to win the vacant title. |
| 16 | Saburo Inematsu | 1 | April 13, 2014 | Tokyo, Japan | |
| 17 | Miyawaki | 1 | June 22, 2014 | Osaka, Japan | Won by referee stoppage after Inematsu dislocated his left shoulder. Initially, refused the title, but was officially recognized as the champion on June 25. |
| 18 | Kengo Mashimo | 5 | August 24, 2014 | Chiba, Japan | |
| 19 | Yuji Hino | 4 | April 12, 2015 | Tokyo, Japan | |
| 20 | Tank Nagai | 1 | September 6, 2015 | Chiba, Japan | |
| 21 | Kaji Tomato | 1 | July 31, 2016 | Chiba, Japan | |
| 22 | Kengo Mashimo | 6 | August 20, 2016 | Chiba, Japan |