Using her Joyful Song, Canderrilla lured a group of men with the allure of treasure as Aigallon arrives and learns it is a ploy for her plan to gather happiness from her arranged treasure hunt. At that time, with only use of the Deinosgrander Zyudenchi unaccounted for, the Kyoryugers arrive and thwart Canderrilla's plan. After getting the people to safety, with Aigallon noticing Daigo's pendant, the Kyoryugers fight Canderrilla's Debo Monster, Debo Zaihon, as Aigallon joins the fray to have Kyoryu Red to himself so he can have his pendant. As Kyoryu Gold arrives to give their teammates an advantage on Debo Zaihon, Kyoryu Black finds Daigo being held by Aigallon as he compared the youth's pendant to his prized jewel: the jewel that Ian and Shiro searched for. Upon learning that Aigallon is the one who killed Shiro and not Debo Doronboss, a furious Kyoryu Black attacks the knight with extreme prejudice before Debo Zaihon arrives and buries Daigo, Kyoryu Pink, and Kyoryu Gold under his stone slabs. Using the Pukuptor Zyudenchi on Kyoryu Blue, the three Kyoryugers return to the Spirit Base to regroup before planning the rescue of their teammates. However, fearing he would lose his cool again, Ian decides to stay back for a bit. As he tells Nobuharu and Torin go ahead of him, Souji tells Ian that they will wait for him. Knowing what to do, as Kyoryu Blue, Kyoryu Green, and Torin deal with Debo Zaihon and Luckyuro, Kyoryu Black arrives with the Deinosgrander Zyudenchi and attempts to use it. Though it failed as Aigallon attacks him, Kyoryu Black learns he can use the Deinosgrander with the Armed On and uses it to force his way through the villains before breaking through the slabs and getting his teammates out. Confirming Daigo's pendant and his jewel are linked, Aigallon loses his treasure to Kyoryu Green as Daigo transforms to join his team in defeating Debo Zaihon with a Kentrospiker/Deinosgrander combo. Enlarged by Luckyuro, Debo Zaihon overwhelms Kyoryuzin and Pteragordon before they combine Raiden Kyoryuzin to finish the Debo Monster off. As the Kyoryugers ponder on the relation between Daigo's pendant and Ian's gemstone, Torin is sure that they will learn the full story of the past.