Yuma defeats Tokunosuke, but the leader of Team Shark shows up! Shark calls Team ZEXAL weak, and challenges Yuma to a Duel under some conditions: first, they will bet their teams' badges, which symbolizes the pride of the team; and second, if Yuma lose, Tokunosuke will enter Shark's team as a slave who does every work. With no other option, Yuma accepts the Duel.
Turn 3: Shark
Shark draws and Summons another "Shocktopus" (1600/800) in Attack Position. Shark attacks "Utopia" with "Shocktopus", but Yuma activates the effect of "Utopia", detaching an Xyz Material to negate the attack.
Turn 4: Yuma Tsukumo
Yuma Sets a monster.
Turn 5: Shark
Shark Summons "Hammer Shark" (1700/1500), and activates its effect, reducing its Level by 1 (Hammer Shark: LV4 → 3) and Special Summoning "Big Jaws" (1800/300) from his hand. He Overlays his two Level 3 monsters to Xyz Summon "Black Ray Lancer" (2100/600), and activates its effect, detaching 1 Xyz Material to negate the effect of "Utopia" until the End Phase. Shark attacks "Utopia" with "Black Ray Lancer", destroying it (Yuma 4000 → 1900). Shark attacks Yuma's set monster with "Shocktopus". It is "Gagaga Gardna" (1500/2000); therefore Shark takes damage (Shark 4000 → 3600).
Turn 7: Shark
Shark activates the effect of "Black Ray Lancer", detaching 1 Xyz Material to negate the effect of "Gagaga Gardna" until the End Phase, but Yuma activates his Trap Card "Gagagarush", negating its effect and destroying it, inflicting damage to Shark equal to its ATK (Shark 3600 → 1500).