During an arranged wedding, Taiya, a mysterious delivery man, rescues Mira. As they flee to the airport in the "Rockstar" car, a monster attacks the family wedding dress. Taiya must transform himself to save the day.
Mira joins Boomboonger and visits the secret garage in the basement of Hando's residence. There, a meeting was being held regarding the next delivery jobs.
Mira has taken a request from a delivery guy. Her client is a boy she met at her part-time job. Mira is ordered by Taiya to complete the mission on her own and heads for the delivery destination with a bicycle.
Mira who was a Boonboomger member is recognized and enjoyed by the public. But somehow her hands were handcuffed. The person who restrained Mira was Shirabe Saibu, an investigator from a certain organization.
Jou is assigned to watch over the Boonboomgers. He wants to protect people in a cool way, so he says, "Please let me join the Boonboomgers!" However, Taiya refuses, saying, "You can't do it!"
Jou is the new member of the Boonboomgers. Ishiro, who is "too serious to trust a police officer who is too serious...", decides to follow Jou to find out what his "secret face" is. Meanwhile, there is a powerful new enemy on Earth...!?
Boonboom has fallen in love. Mira, as a delivery person, decides to take Boonboom to the person he loves. Boonboom falls in love with someone he never expected...!? Meanwhile, Taiya gives something to Genba.
Taiya reveals his real intentions to form the Boonboomgers, which is to participate in the "Big Bang Grand Prix", the biggest and most important race of the entire universe, while fighting the Hashiriyans was not in his original plans.
Taiya is seriously wounded after his fight with Madrex and Shirabe informs the team that the ISA decided to have the Boonboomgers disbanded and their equipment confiscated.
Taiya makes a special delivery to an old friend who inspired him to become a deliverer in the first place. Meanwhile, Cannonborg, another team captain arrives to assist the Sunseaters in taking over Earth.
The Boonboomgers are afflicted by a mysterious phenomena that leaves them apathetic, while Genba approaches Itasha of the Sunseaters with unknown intentions. Meanwhile, Cannonborg completes his secret weapon to counter Boonboomger Robo.
After Genba having successfully activated BoonBoom Safari, Ishiro and Mira pay a visit to an aquarium looking for inspirations to activate BoonBoom Marine, when the Sunseaters return with a fixed-up Boonboom Killer Robo, eager for a rematch.
The Boonboomgers meet Sakito Homura, a mysterious man who possesses the same powers as them, able to transform into Bun Violet and whose intentions are unknown.
Sakito makes an offer to Taiya to join the team. Meanwhie, Sakito's partner Byun Diesel is an old acquaintance of Bundorio and wants to meet him again, but Bundorio refuses and the past between them is revealed.
At the request of Hashiryan, Sakito sets out to eliminate the Boonboomgers. As he attacks, Taiya asks him, "Why did you abandon the Earth?" Will Sakito end up as an ally or enemy?
The time has come for Tanabata but the event brings bad memories to Bundorio. Meanwhile, the Hashiriyans send a new monster that brings Taiya into a pinch.
Mira's ex-boyfriend Norio unexpectedly reappears. And he is with the Hashiriyan for some reason!? Norio's "Wonderful Revenge Drama" begins in order to get his beloved Mira back from the Boonboomgers.
A series of unexplained fires have been burning down the town, and the people seem to be in trouble. Genba, who has become a "detective", deduces the cause.
The Hashiriyans send a monster who torment some children who are enjoying camping in the mountains, and the Boonboomgers field their new Boonboom Car to fight it.
Jou is training baseball with some children when the Hashiriyans attack them and an enraged Jou challenges the villains for a match, dragging the entire team, including Bundorio, Byun and Shirabe on it.
The Boonboomgers pay a visit to an after-school daycare facility where Taiya used to attend and learn more about his past, including his first love, when the Hashiriyans invade the place and put Taiya and Sakito to sleep.
A long time has passed since the Cannonborgs attacked Earth. Calling himself the modified captain, Cannonborg has tormented people. However, Daiya and his friends have thwarted all of his plans.
Shirabe is to explain the Boonboomgers to the head of ISA. Meanwhile, Taiya and the others have to fight a familiar Grumer. What's more, something extraordinary happens...!? The 3rd LAP is about to begin.
Sakito and Byun help with Ichiro's spy job, while Taiya tells the others the story of how he and Ichiro met and became friends and Disrace uses his powers to revive Cannonborg as well.
Mira works part-time on a curry restaurant she has loved since childhood. However, when a rival restaurant opens and customers mysteriously disappear, she and the other Boonboomgers investigate if the Hashiryians are involved.
Genba decides to rely on his friends once again and rejoins the team. The Boonboomgers use their new invention to transform into their powered-up form, Champion Boonboomgers to confront Madrex who is under Disrace's control.
The Sunseaters blame the Boonboomgers for Madrex's death and attack them with their own version of the Boonboom Trailer. In response, the team fields their new vehicle, the Champion Carrier to stop them.
Taiya and the others are astonished upon discovering that Bundorio was once a Hashiriyan and Waruido's friend. As he tries to cope with his past, Disrace challenges the Boonboomgers for a decisive battle.
The threat of Disrace has passed, but the Hasiryan invasion continues. In the future, just like before, they will continue to fight every day, wearing two hats as heroes and part-time workers.
Ishiro meets another spy and old friend of his, who kidnaps him and replaces him with a clone created by a Kurumaju, but Taiya realizes his disguise and confronts him.
The Sunseaters are astonished with the arrival of Weiwei Yarucar, an elite member from the Hashiryan who disbands the group. Meanwhile Spindo's right hand man, Grantu Risk, also arrives on Earth.
As ISA is making suspicious moves, Umesu Maimi, a classmate of Shirabe, returns to Japan. Reunited with her trusted classmates, Shirabe reveals the unrest in the upper echelons, but is simply laughed at. Where on earth does the truth lie?
"You become the hero you want to be!" A boy who admires Bun-Blue appears and asks to become his apprentice. However, Ishirou does not want to get involved in any trouble, so he offers up Jo as a human sacrifice.
Santa Claus, the ultimate delivery man. At Christmas, he brings smiles to children all over the world. Spindo, a visitor from space, is curious about his existence and orders Sansita to present Santa Claus.
Taiya gets confused when Ishiro declares that he is betraying the team and that the Boonboomgers must disband, just when Joe Gibken from the Gokaigers appears to intervene.
Taiya is devastated with Bundorio's apparent death and attempts to fix him up. Meanwhile, Disrace returns and initiates a plan to turn the public opinion against the Boonboomgers but Sakito and Byun rise against him.
With the society viewing the Boonboomgers as enemies, Jou is forced to choose between his career and his loyalty to the team. Meanwhile, Yaiyai Yarucar is turned into a Kurumaju and attacks the Boonboomgers.
Mira is offered a chance to have the Boonboomgers spared from Spindo's wrath by marrying him. As she is forced to make a choice, she and the other members finally decide between submission or challenging the Hashiryians.
