Chapter 1

Takes place right in a Non-Canon timeline after the debut of the King Kyoryuzin in Ohsama Sentai King-Ohger Episode 34.
Also takes place after the first-six chapters of Donbrothers vs Zenkaiger vs Senpaiger, if the main antagonist doesn't get destroyed in that story's final arc.
This special also continues to commemorate the Zyuden Sentai Kyoryuger's 10th Anniversary Celebration.