Episode 18: Menacing Duel Sieger!

"ABC Cup Final! The Great Adventure in the Underground Labyrinth!!" is the 18th episode of the Season 1 anime.

Summary
Gao vs Zanya. On the day before the final of the ABC Cup, Zanya looks back at Gao, telling him that "It's an unfortunate final matchup.". Last year, Zanya lost to Todoroki Genma, the strongest in the middle school age bracket, and hoped to fight him again in the final round. Knowing how Zanya feels, Gao and his friends search for Genma, who is supposed to be being detained somewhere. Shockingly, they find a clue to Genma in a cave under Aibo Academy...