On their first mission as Boukenger, new members Masumi Inou and Natsuki Mamiya are tested by their leader, Satoru Akashi to retrieve the dangerous Heart of Gordom, reawakening a deadly ancient civilization in the process.
The Boukenger can't quite trust Natsuki due to her mysterious nature, while Gajah teams with King Ryuuwon and the Jaryuu Tribe to obtain the other Gordom Precious.
With DaiBouken captured, the other Boukenger find out the truth regarding Satoru's actions as Bouken Red puts his plans into beating Gajah and Ryuuwon to SGS's treasure into action.
Sakura's apparent disregard of life for the mission worries Natsuki as they work together to save children trapped by the Dark Shadow using a legendary pipe Precious.
The Boukenger are challenged by a mysterious female thief to find the five treasures of Princess Kaguya, with the gentlemanly Souta particularly interested in the challenger.
After escaping from Ryuuwon and Naga, Satoru tries to convince Ragi to allow him to help find the Aqua Crystal so that his people's home can be restored.
The Boukenger gain the means to create a sixth member and Satoru wants Eiji to take the position; but to do so means discovering a horrible truth about him and facing down Gajah's newest weapon: the Questers.
With Eiji's Ashu heritage and dark past denying his new duties as Bouken Silver, Natsuki must help him come to grips in order to stop the Questers' new mecha and their city-destroying Precious.
Sakura faces the difficulty between getting and earning what she desires when she becomes the Cinderella within the illusion of a glass slipper Precious.
Satoru teams up with a researcher of the Lemurian civilization to stop Ryuuwon from completing his ultimate desire: gaining the greatest treasure of Lemuria.
A discovery by Natsuki and a teaming of Ryuuwon and Questers leads to their abduction of Bouken Yellow, where the truth of her origin is finally revealed.
With Natsuki a puppet to her Lemurian heritage and to the desires of Ryuuwon and the Questers, Masumi heads forth to save his partner while the rest of the team hold on until the completion of their newest weapon.
The Boukenger undertake a mission to finish collecting a Precious that previously got away from the original trio and now is in the hands of Dark Shadow.
Eiji wanders the dimensional rift trapped with his mother Kei while the other Boukenger must face simultaneous Negative Syndicate attacks for Precious requested by the Questers.
With Eiji still lost and nothing standing in their way of destroying Earth, Satoru makes a desperate move to finally defeat the Questers and their Homunculus.
Masumi tries to finally prove himself to Satoru on a mission to prevent Ryuuwon and his most powerful Wicked Dragon from obtaining a power to rule the world.
As Masumi remains missing, the Boukenger must respond towards Ryuuwon's last-ditch effort to obtain the greatest Precious of darkness before another can begin their ultimate scheme.
As their team falls apart, the four remaining Boukenger must re-find their own missions as Gajah starts regaining the Gordom Precious for his ultimate evolution.
With Satoru's return and the team reunited, the Boukenger return to Gordom Island to face Gajah in a final showdown before he can utilize the power of the Gordom God to rule the world.