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!

Mira is propositioned into a political marriage with Spindor as the team struggles with the fact that they may have lost.

The Boonboomger enter the final lap of their battle with the Hashiriyan.