"Rule Duel", known as "Disorderly Duels Are Against School Rules!? Sally Forth! Special Disciplinary Commander" in the Japanese version, is the seventy-seventh episode of the Yu-Gi-Oh! ZEXAL anime. It first aired in Japan on October 28, 2012 and in the United States on September 7, 2013.
Yuma's been appointed Class Representative! While Yuma is quite eager and willing to do the job, Caswell Francis, known by all as "Class Representative", has mixed feelings about this. The Student Council President appears before Caswell, appointing him as the "Chief Disciplinarian". The Chief Disciplinarian's job is to crack down on violations of school rules, which ends up angering a lot of students at the academy. In order to stop this ridiculous system, Yuma challenges the Student Council President, who turns out to be under Barian control, to a Duel!
Featured Duel: Yuma Tsukumo vs. Carlyle Chesterton
Turn 3: Yuma
Yuma Sets a monster. Carlyle activates his face-down "Surprise Inspection", flipping the monster face-up. It is "Gagaga Girl" (1000/800). This would be a violation of the dress code, so Caswell moves to return it to Yuma's hand. Yuma activates the Quick-Play Spell Card "Clear Robe", reducing the ATK and DEF of "Gagaga Girl" to 0 and negating its effect to prevent it from leaving the field. Carlyle activates the effect of "Norito", detaching an Overlay Unit ("Norito" ORU 1 → 0) to negate and destroy "Clear Robe". Therefore, Caswell's ruling stands and "Gagaga Girl" returns to Yuma's hand. As Yuma controls no monsters and the effect of his Spell/Trap Card was negated, Yuma sends the "Tatakawa Knight" in his hand to the Graveyard via its own effect to inflict 1500 damage (Carlyle 4000 → 2500). Yuma activates "Monster Reborn", Special Summoning "Tamagushi" (1000/2200) from Carlyle's Graveyard in Defense Position. Yuma Sets a card.
Turn 4: Carlyle At this point, Caswell stops the ruling. The duel will be conducted as a Normal Duel from this point.
Carlyle draws and activates "Rank-Up-Magic Barian's Force", letting him Rank-Up the Rank 6 "Norito" in order to Special Summon a "CXyz" monster of one Rank higher. He performs a Chaos Xyz Evolution, overlaying "Norito" to Special Summon "CXyz Simon the Great Moral Leader" (3000/2500) in Attack Position. He activates its effect, detaching the overlaid "Norito" ("Simon" ORU 1 → 0) to change "Tamagushi" to Attack Position. "Simon" attacks "Tamagushi" with Yuma activating his face-down "Half Unbreak", preventing the destruction of "Tamaguchi" by battle and halving the Battle Damage (Yuma 1300 → 300). As his monster battled and its target was not destroyed, Carlyle activates "Double Check", destroying the monster.
Turn 5: Yuma
Yuma Normal Summons "Gagaga Magician" (1500/1000) and activates "Gagagawind", letting him Special Summon a "Gagaga" monster from his hand with its Level increased by 1. He Special Summons "Gagaga Girl" (1000/800) in Attack Position, with its Level increasing by 1, to 4. Yuma overlays his two Level 4 monsters to Xyz Summon "Number 39: Utopia" (2500/2000) in Attack Position. As "Gagaga Girl" was used as an Overlay Unit with another "Gagaga" monster, its effect activates, reducing the ATK of "Simon" to 0 (3000 → 0). "Utopia" attacks and destroys "Simon" (Carlyle 2500 → 0).
The following cards appeared in this episode. Cards in italics debuted here.