Shashiro and Mira are helping BunBun do some summer cleaning at the mansion when they stumble upon a box of some of Taiya’s childhood drawings. The one that catches their eye seems to be of Taiya as a firefighter.
Meanwhile, Mira’s ex-boyfriend Norio is crying and upset about how he lost Mira to those Boonboomger guys. The General3, who are working at this restaurant for some reason, try to cheer him up. But Cannonborg comes out of the kitchen and says Norio should take back what was stolen from him.
Just then, both Sakito and Byundi’s stomachs growl so Shirabe takes them back to the garage where BunBun serves them some of his curry. Both Sakito and Byundi love it.
Shashiro tells the others that it turns out Sakito might have abandoned the planet of his own volition. The others wonder why he would do such a thing and then return after all these years. Taiya thinks of his earlier convo with Sakito.
The Boonbooms are dressed up at a bar that Taiya has just purchased. Sakito and Byundi walk in, expecting a meeting with BunBun. But Taiya says BunBun does not want to meet with them.
As the Boonbooms are on the highway training for the Big Bang Grand Prix, Investigator Shirabe calls them about a strange UFO entering Earth’s atmosphere. Just then, another unidentified thing appears on the highway and crashes into all of them as it speeds through.
Jou is walking nearby and hears the commotion. He hurries over, but hesitates a bit before he henshins. Taiya, Shashiro and Mira arrive and they henshin together.
Shashiro is at the aquarium and is surprised to see Mira works there part-time. She asks what he’s doing here and he flashes back to Taiya and Jou congratulating Genba having gotten Safari’s trust.
Inspired by Sosuke’s relationship with his Go-On Engine, Taiya thought of loading AI into both Boonboom Safari and Boonboom Marine. BunBun planned it out, Taiya assembled Safari and Marine and Shashiro programmed them to become stronger. And they can upgrade them now thanks to their experience.
Taiya thinks he’s found a Boonboom Car in the grass, but it is actually Engine Speedor from the Machine World. Taiya takes him back to the garage and Speedor asks if they can help him find his partner Sosuke.