Mira Shifuto's about to get married to a man she doesn't want to when she's suddenly whisked away by a deliveryman.

Ishiro still won't acknowledge Mira as a Boonboomger as the team has to deliver classified documents to a foreign ambassador.

Mira works part-time on a curry restaurant she has loved since childhood. However, business is not as booming as it once was so the other Boonboomger decide to investigate.

Genba is defeated by Dissrace and rescued by Sakito when they run into a mysterious man on the railway tracks.

The Sanseater are greeted to the arrival of Wayway Yarucar, an elite member of the Yarucar race, as the Hashiriyan prepare for Spindor's arrival.

Mira goes out on her first solo delivery while a clock-themed Hashiriyan tries to stop everything that moves.

After saving a child from getting hit by a truck, Mira is arrested by Officer Akuse and brought in for questioning by the International Space Agency.

Genba has his first solo delivery job for the ISA. Worried about him, Mira decides to tag along, when the Sanseater attack the duo.

Taiya runs into a certain familiar Engine and takes on the job delivering him to his partner.

The Boonboomgers are afflicted by a mysterious phenomena that leaves them apathetic, while Genba approaches Itasha of the Sanseater with unknown intentions. Meanwhile, Cannonborg completes his secret weapon to counter Boonboomger Robo.

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.

The Sanseater blame the Boonboomger for Mad Rex's death as Taiya surprises the team with a new Boonboom Car, the Champion Carrier.

Mira's childhood friend grows jealous of her as the Hashiriyan hatch a plan to send out two monsters at once.

Spindor is given the offer of the Earth's soccer league being part of his own Big Bang Soccer league, which Sakito and Genba take issue with.

Spindor is curious about Santa Claus and wants him kidnaped and brought before him.

Ishiro trails Jou, thinking his overly serious policeman persona might just be an act when a toilet-themed Hashiriyan starts forcing the truth out of people. Meanwhile, Taiya has to deal with a new foe.

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.

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 team is distraught after Genba left and Jou decides to work even harder to make up for it.

A boy who admires Bun Blue appears and asks to become his apprentice. However, Ishirou does not want any part of it, leaving the situation to Bun Black instead.

Jou wants to become a Boonboomger, but Taiya rejects him, saying he doesn't have what it takes just yet.

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 Sanseater in taking over Earth.

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 Sanseater return with a fixed-up Boonboom Killer Robo, eager for a rematch.

Jou finds a monster created by the Hashiryan who refuses to attack humans and befriends him, determined to protect his new friend from the enemy.

Summer! Camping! Tent Grumer!? Tent Grumer interferes with children who are enjoying camping in the mountains. Then, Taiya and the others challenge the newly born "Boonboom Leon" to a battle!