This is Sakito and Byundi. This is the story before meeting Earth's Boonboomger.

Bakuage Sentai Boonboomger formation lap: Settlers of the Galaxy

Before Sakito and Byun Diesel return to Earth as seen in Bakuage Sentai Boonboomger's 16th episode, "Purple Settler", we witness this universe-spanning tale of the Settler duo, Sakito Homura and Byun Diesel, before their return to Earth after over a decade of absence.