The Boonboomgers and HIKAKIN are filming a collaboration at a circuit purchased by Taiya Hando, when suddenly a princess from the planet Trickle escapes! The Boonboomgers protect her from Demon Thunder, the Catching Captain, who threatens to launch a planet-destroying missile at Earth if the princess is not handed over! The power of Demon Thunder has transformed the circuit that Taiya bought into the Circuit Grumer, and what's more... The usually reliable Boonboom Cars have also been swallowed by Circuit Grumer, and are now under his control!? The unpredictable situation puts the Boonboomgers in a big pinch!
