Bronk gets the idea that he'll be able to impress Rio if he beats Shark in a duel. After Shark turns down his offer of a duel, saying he is not even at Yuma's level, Bronk jumps to conclusions and soon a rumor spreads around the school that Yuma and Rio are dating. Believing Shark to be the cause of these rumors, Rio challenges him to a duel, which turns out to be their 100th Dueling Squabble between siblings. Shark summons out Aero Shark whilst Rio summons Zerofyne. However, Rio is put in a pinch when Shark counters her strategy by summoning out Black Ray Lancer. As Shark shows little faith in Rio's confidence as a duelist, Bronk gives her words of encouragement, giving her the courage to summon out Ice Princess Zereort and deal damage to Shark. However, Shark responds by turning her field spell against her summoning out the powerful Shark Caesar and winning the duel. After the duel, it is revealed the rumor was all due to Flip and Caswell's misunderstanding, prompting a swift revenge from Rio.