This time, the "deliveryman" Taiya Hando's package is a bride, Mira Shifuto! After taking Mira out of the church, Taiya escapes from his pursuers and encounters the Hashiliens, a large cosmic invasion force. Hashiryan's purpose is to collect humans' scream energy Gyaughsoline. In order to protect people from the Hashiliens, Taiya changes into Boon Red and fights...!

Mira is accepted by Hando and becomes a member of the Boonboomgers. However, her fellow member, Ishiro, does not approve of Mira. Mira and Ishiro, who seem to be incompatible with each other, are once again interrupted by the Hashiryan while carrying a "delivery full of secrets"...!?

``I got the job! I'm the delivery guy!'' Mirai took the delivery guy's request. The client is a boy I met at my part-time job. Mirai is ordered by Daiya to complete the mission on her own and heads for the delivery destination on a bicycle. Behind the scenes, the old clock's bitter demon beast was created and set out to collect Gyasolin. People stand still as if time has been taken away from them in front of the demon beast that targets moving things. However, the driver did not stop.

``I want Bunbunja to disband.'' A future where Bunbunja is recognized by the public and has fun. But somehow his hands were handcuffed. The person who restrained the future was Hosobucho, an investigator from a certain organization. She suddenly issues a "dissolution order" to Daiya and the others. The exercise of power, the struggle for justice, and the cry for help. A wave of hellish heat covers the three-way situation.

``Please put yourself in the Bumbunger!'' Akuse Jyo became the liaison between the ISA and the Bumbunger. Locke, who dreams of becoming a hero, asks him to join Bunbunger, but Daiya simply rejects his answer. In other words, something is missing from the lock. What is a hero? Who will we fight for? Will the lock be able to shoot through the center of Daiya's chest?

``His hidden face... will definitely be exposed.'' Lock joined Bunbunger. Shashiro describes Lock as a ``too serious police officer,'' but he becomes suspicious of Lock's shockingly straight-lacedness and follows him. The face you show to others and the truth you hold inside are not necessarily the same. What color is underneath the lock's black mask? Meanwhile, Madrex, the leader of Hashiryan Slash, attacks Earth. He engages in a one-on-one battle with Daiya who rushes in. This fate cannot be easily washed away.

``You seem to be in trouble.'' Bundrio is suffering from an unknown problem. In order to free him, Mirai and Lock go out into the city. However, a bitter beast appears on the way. Daiya and Yashirō rush in and begin the battle, but Madrex attacks to interrupt them. The four Bunbungers are suffering in a raging battle. Genbo shows up to help as usual, but the four people he sees work together brilliantly and carve out a path. The wall that rises in front of the barren shrine, and I wonder whether I should climb over it or break it down.

``It seems like my dream lies after defeating this guy,'' Genba said. Bunbunjar was created for Daiya's dream. Said Shiro. Right now, it's just being repurposed for use against Hashirian. Bunbunja is Daiya Hando's hobby... Mirai and Toki express their confusion as they have not been told anything, but this does not stop Hashiryan's invasion. With their hearts torn apart, will they be able to defeat Madrex? And what exactly is Daiya's dream, which he doesn't talk about much?

``I fell in love with that dream! I will deliver that dream.'' After a deadly fight with Mad Rex, Daiya was left with injuries all over his body. Cracks have appeared within the team, and leadership can no longer be maintained. According to Key, who appeared in such a hopeless situation, ISA decided to disband Bunbunja. While everyone held their tongues, Bundorio squeezed his voice out and began to speak. The story of meeting Daiya, Daiya's dream, and Bundrio's dream.

``I don't really understand being serious when it comes to myself.'' The delivery person receives a request from ISA. The object they are carrying is a certain dangerous substance that will cause a huge explosion if it is impacted. Genba, who was entrusted with the transportation, departed, feeling excited. However, along the way, he happens to meet Mirai, who joins in and things become a big fuss. A beast that speaks a strange language appears and the delivery job becomes chaotic. With ambitions higher than the roof, will you be able to defeat an enemy that cannot stand on the ground?

``The best reward is to see the smile on the child's face.'' Lightning Tech CEO Raita Naito. Naito, the representative of a large global company, could be considered Daiya's teacher. Naito then asks Daiya to work as a delivery man. The destination was a child's hospital room about to undergo surgery. He wants a special present to be delivered to the child. Daiya readily accepts the request of none other than his mentor, but as he completes his mission, a beast appears. Shishiro and four others rush forward and begin the battle, but they are affected by mysterious radio waves and start attacking each other. Daiya's request from Naito is also important, but he never misses a crisis when his friends are in danger.

"Hey, it's been a while, buddy," Daiya heard a pained voice from the grass as he headed home after work. The owner of the voice is Speedle, the Engine God who came from the Machine World. Speedle asks him to deliver himself to his partner. Daiya, who understands the importance of a partner, readily accepts the request. However, just then, Hashiryan appears. Daiya and his friends rush forward, but are forced to struggle against the Kumaju, which has been modified from Cannonborg. And a man appears there. That man was once a red warrior who saved the world.

``If you need Gyasolin, leave it to this procurer.'' Cannonborg, frustrated by his repeated defeats, develops a new weapon. A new weapon created by tracing the Bun Bunger system developed by Daiya, a development genius, stands as a powerful enemy. However, Daiya and his friends were unaware of this and were hit by Sunseeter's attack as per Cannonborg's strategy. For some reason, the members of Bunbunjar, whose password is ``bakuage'', have become ``bakugoe''...! ! ─And Genba, who suddenly disappeared in a tragic situation that seemed like everything was going to end. He switched to Sunseeter and resumed his job as a procurer.

``If I can't protect an important place by myself, even Marin won't recognize me.'' The aquarium is a place to soothe the heart of Yasushiro, who has been devastated by his reckless espionage activities. That day too, Shashiro was alone at the aquarium to calm his mind. However, what was supposed to be a momentary moment of peace turned into a future where I worked part-time. Shishiro grimaces as he tries to change his mood, but suddenly a beast appears. Future asks Shishiro to cooperate with him, who is determined to keep his precious place from being polluted, but he refuses because he can't let go of his pride. Will there ever be a thaw in the cold relationship between the two?

"I am a beast that does not attack humans..." Hundreds of millions of years ago, dinosaurs reigned at the top of the ecosystem. A beast was created from that fossil. Locke rushes to the scene of the commotion and prepares for battle, but for some reason, the demon beast escapes from the scene. After a search, Locke finds the beast, but he still doesn't feel any hostility towards it. A bitter beast that does not attack humans. The lock begins a one-night conversation to make up for 100 million years of loneliness.

``It's going to be expensive to deal with this.'' Daiya and his friends train hard for the BBG. A flash of purple lightning leaves everyone behind... Judging from the traces left at the scene, it seems that its roots are related to Bundrio. But strangely, the Bundrio in question has no idea. While everyone is scratching their heads, a mysterious man appears who dabbles in locksmith and locksmith work. This is what the man surrounded by chaos calls himself. The best disposer in the universe...

``Let's leave this planet to Hashirian.'' Homura Ponto and Byun Diesel, who appeared like a comet, contacted Bunbunger to meet Bundrio. However, Bundrio refused. Bundrio and Bundy used to be rivals in BBG, but it was a bitter memory for Bundrio, who kept losing. On the other hand, the dialogue between Ponto, who says he has abandoned the Earth, and Daiya, who fights to protect the Earth, runs parallel. A man with a fire behind his cool face, and a man with a shadow behind his radical words. Is there a future where these two can understand each other?

``This is a request from Hashirian. Scatter here!'' When Homura Ponto was ten years old, he left Earth and departed for space. Every day, as a disposer, he travels across the stars to settle all sorts of troubles. Those days filled with the scent of danger gave Ponto a place to live. However, Ponto has only one friend on Earth. Taking advantage of Ponto's feelings, Hashiryan presents certain conditions in exchange and asks him to get rid of Bunbunjar. Ponto, who cannot change his back and stomach, bares his fangs at Daiya, but Daiya listens to the screams that sleep within Ponto.

``There's no place we can't go.'' Tanabata is the day when Orihime and Hikoboshi meet once a year. Bundrio had bitter memories of the Milky Way, which is full of stars and wishes. The Amanogawa circuit used to be the BBG qualifying race where Bundy competed against the competition. So Bundrio is afraid of flying... However, even on such a day, Hashiryan's attacks do not stop. The ATM Gurmer created by Sunseeter attacks people with guru money bills that turn personal assets into weight. Yasushirou sees through the attack and forces Daiya to leave the front line. If Daiya gets hit, the attack will instantly kill him, and he will have no choice but to fight with other members. Will Bundrio, whose partner has retreated, be able to dispel his fear and fly through the skies?

``If you try to control someone else's steering wheel, you'll neglect your own!'' A man at a diner breaks down in tears and complains. He was Norio Furino, who was once in a relationship with Mirai. Norio thinks that Bunbunjar is the reason why Mirai left him and is growing resentful towards him. Cannonborg, steeped in human malice, seduces Norio and plans to capture him in the future. However, there's no way Mirai will let go of the steering wheel now... As usual, the driver doesn't stop.

``Daiya, I've come to deliver your dream!'' While cleaning Hando's residence, Bundorio finds a picture that Daiya drew when he was young. The painting depicts Daiya's past dreams. Bundrio rushes downstairs to get Daiya to tell him about his dream, but ends up getting into a quarrel with Daiya who was working on it. Meanwhile, suspicious fires continue to occur in the city where Lock is patrolling. Genbo begins an investigation as a ``candy detective'', but it appears that the cause of the suspicious fire is a bitter demon beast... Bun Bunger is tormented by the blazing hellfire. The key to the breakthrough is the reconciliation between Daiya and Bundrio, and the evolution of Bunred. Just when everything is about to be burnt down, a crimson warrior rises...

``Adults love to see children's smiles.'' Daiya's teacher, Naito, calls the delivery shop. The request is to deliver fireworks to his grandson, Senji, who is camping. However, a beast appears in the mountains where Senji is playing. Ponto, who happened to be camping, rushes in, but is caught in the crossfire and sustains damage. Daiya joins them, but after a fierce battle, the beast becomes gigantic. Furthermore, due to Cannonborg's strategy, Nejiretta and his friends also acquire gigantic forms. In a pinch where many enemies are a threat, a new Bunbunker created by Bundrio and Yasushirou arrives. At first glance, the car looked like a fire engine, and it also had the appearance of a red lion... A lion roars on a burning mountain.

``Play baseball with me...with us!'' Lock, a youth baseball coach, swings a bat on the field. But suddenly, Grove Groomer attacks. It showed the harshness of baseball to the children and gave them despair. Bunbunger and his friends rush to attack, but the lock stops the battle. He unexpectedly challenges Hashiryan to a match in baseball. The battle was so fierce that it melted the sun. However, the Hashiryan team cowardly continues to make rough plays that ignore the rules. In the end, a flaming fireball hits the pitcher, Lock. Locke lost consciousness in the outfield. When Locke wakes up, what he sees in his blurred vision is a scoreboard with a huge difference in points...! !

``The words that the teacher delivered to me at that time were...'' Members of Bunbunja visit the schoolchildren that Daiya used to attend. There, Daiya shows off his guitar performance to the children. An employee who saw Daiya suddenly begins to talk about his insignificant first love. Her first love is Mahiro-sensei. The staff member narrows his eyes and says that it was Mahiro-sensei who taught Daiya, a boy who liked to be alone, how to play the guitar. But she's not there anymore... While the story of Daiya's past is blooming, a beast of pain attacks. Daiya and Ponto immediately tried to protect the child, but were attacked and were lured into a dark dream. Genbo and the others try hard to wake him up, but Daiya and Ponto don't move. Inside a dream, cut off from the outside world. The person who appeared in front of Daiya was Mahiro Sensei, who he was supposed to never see again.

"I know. It's better to run with them..." A long time has passed since Cannonborg attacked Earth. Cannonborg calls himself the remodeled captain and has been tormenting people. However, the entire operation is thwarted by Daiya and the others, and the amount of Gyasolin recovered is very small. Due to heavy pressure from the main family of Hashiryan, Cannonborg has no choice but to do so. Cannonborg, frustrated by not being able to carry out his mission as planned, activates his secret weapon, the "Mass Scream Weapon." Ponto and Bundy, who learn of the horror, change their minds and whisper that the Earth will become a "planet of death." As the time limit to activate the weapon approaches, Bun Bunger is dispatched. Now is the time to put an end to Cannonborg. Ponto's choice is...

``...There's one thing I would like to confirm with Director Tsuneyari.'' Hosobucho visits ISA's Operations Headquarters Chief Eiichiro Tsuneyari and gives a regular report on Bumbunger. They defeated Cannonborg and peace on earth was preserved. The Daiyas who are involved in the incident have returned to their daily lives, working hard on their respective jobs and continuing to protect the peace of the city. But is this peace really what Daiya and his friends have achieved? Isn't it just that we're being shown a chaotic peace created by some great being? The creeping miasma is almost here.

"I'll never forget your face. You... Dislace" Dislace, the leader of the reconstruction team who came to Earth in place of Cannonborg. When Genba saw this, he suddenly became enraged and attacked without hesitation. However, Dislace's strength is so great that Genbo collapses before he can even touch it. Mirai and the others are perplexed by the situation, but Daiya seems to be able to understand something... Genbo eventually regained his composure and began speaking. He talks about his origins, his past, and his encounter with Daiya. The choice he made after confessing was not at all easy.

"He's my enemy. I won't hand him over to anyone." Genba leaves Bunbunger. Mirai and the others are disappointed, but Daiya seems to have something in mind... Meanwhile, Dislace spreads out a carpet soaked with Gyasolin from the previous battle, and uses his secret techniques to revive Madrex. Daiya and his friends are confused when the enemy they thought they defeated appears. However, Madrex, who was sincere in his rampage, lost his momentum, and his eyes became dark and stale.

Sakito and Byundy decide to help out with Ishiro's spy work. At the same time, Taiya was telling the other members about his encounter with Ishiro. In fact, Taiya and Ishiro were originally enemies...!?

``I will risk my life to restore Madrex-sama's memories!'' Madrex has been turned into an obedient doll by Dislace's brainwashing, and there is no trace of his former fierceness and daring. In order to break out of this situation, Sunseeter stands up to recall the memories of her master, who was turned into a puppet. The first place he landed on Earth...named his archenemy Bunbunjar... Madrex struggles to stimulate the memory fragments, but he remains completely unresponsive. Just when it seemed like everything was exhausted, Itasha suddenly spoke up. Trying to make a request to the delivery person.

"Leave the curry to me. We'll compete fair and square with the taste!" Ponto visits a newly opened curry restaurant hoping to try something other than Bundrio's for a change. A big smile spreads across his face as he is presented with the curry. But in the next moment, the curry disappears from the plate, leaving only the memory of having eaten it. Unsatisfied, Ponto visits the restaurant again and again, eventually losing his mind. Then, Ishiro and Jo go to investigate the restaurant, but are swept away by the queue. There is something strange about this restaurant... The only way to save Ponto and his friends, who are obsessed with curry, is to create an even more delicious curry. Bundrio, the curry warrior with a future as a part-timer at the curry restaurant, steps up and puts the pot on the fire for his friends.

``You're looking for a place to die.'' Ponto carries the collapsed Genbo to a deserted place and treats him. Then, the ephemeral sound of a harmonica echoes there. The person playing the song was Akira Nijino, who calls himself ToQger. He was also wearing orange clothing. When Akira sees Ponto and Genbo in a tense situation, he somehow proposes a sumo match. Although the two are confused, they collide... At that time, a bitter demon beast appears in the city. Shishiro and his friends are also attacked and are unable to fight. In order to get through this predicament, what is important is "imagination" to grasp victory. Just as Daiya was about to make a move to revive himself, Tokkyu No. 1 appeared with the sound of a high-pitched train whistle! !

"No one can take away your hopes and dreams. They can't be erased." Madrex loses his steering wheel to Dislace. And Genba is also caught up in his desire for revenge against Dislace, and has lost sight of the steering wheel he should hold on to. Will the two of them have no choice but to continue dancing in the palm of Dislace's hand? However, Daiya smiled as usual. The friends I believed in would one day get back behind the wheel. Bumbunja was once scattered. When everyone's hearts become one again and surpass their limits, they will not give up anything.

"You were the boss's favorite, weren't you?" The Norimichi residence was in high spirits as they celebrated Genba's return. In the midst of the joyous banquet, Daiya shows off his new Bunbuncar. A large machine designed with BBG in mind, capable of overcoming any rough road in space, it's called Champion Carrier. At Naito's request, which came at just the right time, Daiya and his friends set off to test out the car's performance, but suddenly, the Hasiliyan army appears. After an extreme race in which they fight on board the car, Daiya and his friends arrive at a dark place... Then, Disrace appears, looking all knowing. Disrace begins to talk lewdly about the secret of "a certain person." This becomes a huge wall that blocks Daiya and his friends' journey, however...

``This is the handle I hold. I came to say something to him!'' Bundrio used to belong to Hashiryan and worked on weapon development as a favorite of his boss, Spindo. Hando's residence reveals its dirty past. Bundrio spoke as if to squeeze him out, but the members of Bunbunger accepted his sin and promised to live together in the present and in the future. Destroy Hashiryan and rise to the top of BBG. The cunning Dislace laughs at that dream and flees into space. However, Dislace's relief was short-lived, as a blue champion stood on the dark surface of the moon.

``Why don't we just take a short detour for now?'' The threat of Dislace has passed, but the Hashiryan invasion still continues. The future will be the same as before, wearing two pairs of sandals, one as a hero and one as a part-time worker, and fighting every day... Gradually, Bunbunja was recognized by the people of the city, and his exciting achievements were widely supported. There is a woman looking at such a future with envy. I also want to be the main character. The earnest wish that everyone has will cause turmoil in the town where the hero lives...! !

"Let's end this now. You..." Shashirou left Bunbunger and investigated ISA and Lightning Tech on his own. The truth of Hashiryan's interests gradually becomes clear, clouding the mind of Daiya, who has Naito as his mentor. As Yashirō moves to clarify everything, he is approached by his former spy friend Stair. The two meet again for the first time in a while and exchange a few words... Next, Yashirō appears at Hando's residence and pulls out his gun without hesitation. Then, as expected, he points the gun at Daiya.

"Would you three lowlifes like to take a run together?" Sansita is busy cleaning up ahead of Spindo's arrival on Earth. She is waving her broom with enthusiasm, thinking it's the biggest job she's ever done. Then suddenly, a gate opens up in the air from the highway space. Out of the gate comes a crested Yalkar, named Weiwei Yalkar. Weiwei calls himself an elite of the Yalkar tribe, and says he's come to scout Yaiyai Yalkar, who is active on Earth, for the Elite Highway. Yaiyai is attracted to the opportunity that has fallen upon him. What will Decotrade and Itasha, who are watching Yaiyai Yalkar, decide to do... Meanwhile, Daiya and the others are fighting the Beast of Torment. Sensing something, Daiya looks up to the sky and sees a mysterious object wrapped in black flames approaching. It lands with an explosion and when the smoke clears, it is Grantz Lisk, the number two of Hashiriyan, standing there.

"Listen carefully too, the screams from all over the planet. It's unbearable." While ISA is making suspicious moves, Umesu Maimi, Shirabe's classmate, returns to Japan. Shirabe is reunited with her trusted classmate and reveals the unrest in the upper echelons, but is simply laughed at. Where does the truth lie? Meanwhile, Grantz contacts Sansita, and Spindo's arrival on Earth is finally upon us. A bitter beast containing Grantz's power is created, and Bunbunger fights back, but everyone except Daiya is defeated by its powerful attack. Just when it seems they are in a desperate situation, Hashirian General Warui Spindo appears. However, his arrival was sudden and did not catch the ISA's radar. Spindo's expression is filled with ecstasy as he hears the screams caused by the war and poverty that are rampant on Earth. He declares war on his former comrade Bundrio, and once again his cheeks relax at the smell of screams.

"You become the hero you want to be!" A boy who admires Bunburu appears and asks to become his apprentice. However, Ishirou doesn't want to get involved in any trouble, so he offers up Joe as a human sacrifice. Joe ends up taking on an apprentice, and patrols the city to show his own hero activities. He helps the elderly, repairs bicycles, and rescues lost dogs... None of these are like the Bunbunger he admires, and the boy is disillusioned because they seem so unimpressive. In the end, Joe makes a mistake because his sense of justice goes awry. Seeing Joe like that, the boy argues that heroes should not make mistakes. However, all humans are creatures who make mistakes. So what is it that makes a hero a hero?

"I'm counting on you to take care of Earth's soccer!" Spindo's invasion of Earth is progressing like a silk scarf. Many Earthlings are falling to the traps in order to get their hands on Hashirian, and even the space interests. And to make matters worse, the upper echelons of the Soccer Association have begun to move to hand over Earth's soccer to Hashirian. The Bunbungers rush into the scene of this shady deal. They can't hand over soccer, which is loved all over the world, to Hashirian. Daiya and his friends decide to settle things with Big Bang Soccer, but they can't hide their confusion at the storm of rough play and unreasonable rules. Their only hope is Genba and Sendo, who were once active in the prestigious Big Bang Soccer team "Pulse Ace". However, the two get so heated that they lose sight of their surroundings, and they repeatedly clash.