E9. Grand Adventure! Did Jun and Mary Discover the Legendary Ancient Golden Civilization in the Jungle?!

Jun is left aimlessly wandering in the jungle in search of the testing area. Meanwhile, the rest of his classmates are facing a potentially watery end over a spectacular waterfall if they cannot answer the questions correctly in time. Mumei takes this opportunity to have a rematch with Shuu and to show the true might of the Shokatsu Technique!