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{{episode summary|While [[Yuya Sakaki|Yuya]] fights on to become qualified to enter the [[Maiami Championship|Junior Youth Championship]], at the [[Leo Institute of Dueling]], [[Declan Akaba|Declan]] is researching on "[[Pendulum Summon]]s". Yet, an attack on an LID member happens again for the third time. [[Mr. Curio Sawatari|SilvioSylvio's father]], a powerful man in the city and frustrated by the attack on his son, hunts down Yuya. At the same time, a series of suspicious incidents happen around him. And before Yuya, a new "[[Shay|black shadow]]" appears.}}

[[NakajimaClaude]] informs [[Declan]] that [[Yuya Sakaki]] won his first match. Despite Declan making the effort to request that Yuya's entrance into the [[Maiami Championship|Junior Youth Chamionship]] be approved, Yuya turned it down. Amused, Declan admits that he did something unnecessary, and muses that the fact that Yuya has chosen to carve out his own destiny is to be expected of the originator of [[Pendulum Summon]]ing. He asks if Yuya used Pendulum Summoning this time, and Nakajima Claude confirms that a Summoning reaction was detected by the Control Room. Declan asks if there was any change to it, and NakajimaClaude, surprised by the statement, states that there wasn't. Musing that Yuya "has yet to..." Declan gets up from his desk and looks out of the window. Nakajima Claude speaks up, there's something that's been bothering him. Recently, they've been detecting exceptionally strong levels of [[Fusion Summon]]ing in [[Maiami Paradise City]]. Though he initially assumed that it was the students, both Declan and Nakajima Claude agree that it can't be compared to that of the students. Declan orders the Summoning monitored, and thinks that first it was [[Xyz Summon]]ing, and now it's Fusion Summoning.

At the harbor, [[Zuzu Boyle|Zuzu]] and [[Sora Shiun'inPerse|Sora]] are Dueling; Sora controlling "[[Fluffal Bear (anime)|Fluffal Bear]]" while Zuzu controls "[[Aria the Melodious Diva (anime)|Aria the Melodious Diva]]" and "[[Sonata the Melodious Diva (anime)|Sonata the Melodious Diva]]". She activates "[[Polymerization (anime)|Polymerization]]" from her hand, fusing "Aria" and "Sonata," and she [[Summon chant|chants]], "Enchanting melodies bloom in splendid glory and play for us a new harmony! Fusion Summon!" But instead of a monster, an error message pops up on her [[Duel Disk]], and Zuzu panics, frantically asking why it didn't Summon her [[Fusion Monster]]. Sora asks if she remembered to put the monster into her [[Extra Deck]], and Zuzu reacts in confusion. Sora patiently explains that he's told her a dozen times that Fusion Monsters go in the Extra Deck, not the [[Main Deck]]. Shamefully admitting that that's right, Zuzu removes her Deck from her Duel Disk and sees "[[Schuberta the Melodious Maestra (anime)|Schuberta the Melodious Maestra]]". Behind a nearby warehouse, [[Yuto|the masked Duelist]] is eavesdropping. Later, Sora points out that Zuzu had front-row seats for two of his Duels, and she should have been able to figure Fusion Summoning out form that. He could have beaten the Duelists without Fusion Summoning, but did so anyway so that Zuzu could learn. Zuzu apologizes, and Sora jumps down from the container he was sitting on, commenting that he bets that she was thinking about ''him'' again, wasn't she? Zuzu blushes and looks away, and Sora proclaims that he knew it; that's why Zuzu's been Dueling so absent-mindedly. He asks who the Duelist is, but Zuzu doesn't know, so instead Sora asks to confirm that it was the second time that they'd met. Zuzu admits that the first time had been here as well, when he'd stepped in to save her from [[SilvioSylvio Sawatari|Sylvio]], telling her that he didn't want her to get hurt. Sora asks if that's how the masked Duelist stole Zuzu's heart, prompting an embarrassed response from Zuzu. Fortunately for her, Sora doesn't press the issue further, admitting that he's excited himself, as the Duelist seems like a pretty interesting guy. If [[Masumi KotsuJulia Krystal|Julia]] hadn't butted in, he might have been able to Duel the masked Duelist. Taking a large bite out of a chocolate bar, he comments that that was really disappointing. Zuzu protests that Sora can't Duel him, as he's dangerous. She remembers the Summoning of "[[Dark Rebellion Xyz Dragon (anime)|Dark Rebellion Xyz Dragon]]" and wonders why the Duelist was able to create actual shockwaves outside of an Action Field, and why he told her that he didn't want her to get hurt anymore.

The masked Duelist remembers standing in a [[Heartland City (ARC-V)|destroyed cityscape]], claiming that he didn't want to hurt anyone anymore. He hears something up to his right above him looking up to see a [[Yugo|white-suited Duelist]] sitting astride a [[Duel Runner]]. The Duel Runner projects its screen and Card Zones, and the Dark Duelist activates his own Duel Disk. The White Rider ramps off the building and charges towards the Dark Duelist. An explosion of dust rises up, the Dark Duelist emerging and Summoning his "Dark Rebellion Xyz Dragon". Swerving away from the Dark Duelist, the White Rider Summons his own monster, a [[Clear Wing Synchro Dragon(anime)|a glowing white dragon]], and both [[Dragon]]s charge and clash. [[Shay|The Duelist in the blue coat]] who had been surveying the [[Leo Corporation]] runs up with [[The Resistance|four of his fellows]], and the White Rider grits his teeth in annoyance before fleeing. The second Duelist asks the Dark Duelist where [[Ruri Kurosaki|Ruri]] is, but the Dark Duelist just shakes his head. The second Duelist curses.

In Declan's office the next day, he reacts in surprise to two cards on his desk, explained by [[HenriettaAkaba|his mother]] to have been sent anonymously to them that morning. [[Marco (card)|The]] [[Tio (card)|cards]] bear the images of [[Marco (ARC-V)|Marco]] and Tio. Henrietta asks what the perpetrator is doing, sending them card of two of [[Leo Institute of Dueling|LID]]'s ace Duelists. Declan explains that there was another powerful Xyz Summoning reading picked up the previous day, and shortly after, they received a report that Tio had disappeared as well. To think that they would be [[Human Sealing Technology|sealed inside of a card]]... Henrietta is shocked, and Declan admits that it's the first time that he's witnessed this in reality. But this means that Marco and Tio are alive. Henrietta asks whether they can be saved, but Declan admits that they can't with their current power. He notes that this raises another question. There have been three incidents so far; the first involving Silvio, but he was not sealed inside a card. But both the second and the third, Marco and Tio, were sealed. This suggests that there are two perpetrators. Henrietta is shocked at the prospect.

NakajimaClaude's voice is heard, begging the congressman to wait. The doors crash open, as [[|Curio Sawatari|Mr. Sawatari]] asks Declan what he's doing loafing around. Nakajima Claude begs him to wait outside, but Mr. Sawatari tells him to can it; he's got business with the Director. Nakajima Claude protests that Mr. Sawatari doesn't even have an appointment, and Mr. Sawatari asks if there's a problem with the future city president coming to see the director of the election committee. Declan tells Nakajima Claude to let Mr. Sawatari stay. Mr. Sawatari comments that he heard they had another incident. Henrietta tries to play dumb, but Mr. Sawatari isn't fooled, warning them not to underestimate the information network of the future mayor; he's heard that first a teacher, then the ace of the top team got taken out. Henrietta is a little flustered, but Declan admits that it's true. Mr. Sawatari angrily asks why they're sitting there folding their arms. Declan reassures him that they're currently investigating the perpetrator. Mr. Sawatari protests that his son already testified that Yuya Sakaki attacked him, slamming down a photo of Yuya on the desk. Declan asks if Silvio Sylvio is still saying that, and Mr. Sawatari admits that he hasn't seen Silvio Sylvio since he got out of hospital, but neither has he heard anything about the testimony changing. He points out that Henrietta had even agreed to handle things and leave everything to her, so why are they sitting around and letting the perpetrator cause a second and third incident? He can't keep quiet about this; he's got to get the cops moving by his own hands to protect the order in Maiami Paradise City and catch Yuya Sakaki. Declan asks him to please hold on a second, but Mr. Sawatari isn't waiting.

Slamming his hands on his desk, Declan gets to his feet, intimidating Mr. Sawatari. Declan warns Mr. Sawatari that he said that it was under investigation; they aren't just twiddling their thumbs here, and have risen the efforts in both Leo Corporation and LID to find the perpetrator. Mr. Sawatari protests that he told them that the perpetrator is Yuya Sakaki, but Declan defensively replies that Yuya is no criminal. They will surely find the real perpetrator; until then, he'd like Mr. Sawatari to watch quietly. Huffing, Mr. Sawatari snatches up Yuya's picture, claiming that he won't accept failure from them and storming off. Declan orders Nakajima Claude to raise the level of alert in the inner city. The cards are clearly meant to provoke them, and they need to make sure that they're ready to handle any incident. He orders Nakajima Claude to have the cards analysed thoroughly, in order to save them, no, all Duelists in Maiami Paradise City.

In the streets below, Yuya is yawning, having watched quiz shows all night. He's supposed to be training his mind for a battle of wits, but can't think now because he's so sleepy. He overhears Mr. Sawatari screaming at three LID top-team members, asking if they're deaf. He's an active city councilor, and will be the town mayor soon, the most powerful person with the most influence. A woman asks her friend who he is, and her friend replies that he's that Sawatari guy from the city council. The first woman expresses her disgust that Mr. Sawatari is carrying on like that even though he isn't the mayor. Mr. Sawatari tells the LDS LID students that that means they have to follow his orders, not the Director, not the CEO, but him, the mayor. Yuya ask if that's SilvioSylvio's father, but then he remembers the time; if he doesn't hurry, he'll be late for his meeting with [[Nico Smiley|Nico]]. He runs off, and Mr. Sawatari sees him in the reflection of a shop window. He pushes the LID students forward, yelling that Yuya is the perpetrator they've been looking for, yelling them to hurry up and catch him when they hesitate. They run after Yuya, Mr. Sawatari screaming for Yuya to stop. Yuya quickly realizes he's being chased, and when accused by Mr. Sawatari of hurting SilvioSylvio, protests that he didn't do it.

==Featured Duel: Zuzu Boyle vs. Sora Shiun'inPerse==[[Duel]] already in progress. [[Sora Shiun'inPerse|Sora]] [[control]]s {{Monster|Fluffal Bear}}, while [[Zuzu Boyle|Zuzu]] controls {{Monster|Aria the Melodious Diva}} and {{Monster|Sonata the Melodious Diva}}.

{{Decklist|Sora Shiun'inPerse