Yu-Gi-Oh! ARC-V (Season 2)

Synchro Dimension Arc is the second story arc of Yu-Gi-Oh! ARC-V anime series. It follows Yūya and his friends' struggle in City of Synchro Dimension to gather allies and facing the threat from Jean-Michel Roget, a former Academia agent who became the Director of Security and plans to turn Synchro Dimension into his own personal kingdom.

Arrival
Yuzu, who got transported to Synchro Dimension with Yūgo, learned that Rin is Yūgo's childhood friend who was kidnapped by Yūri, and he mistook Yūto as Yūri when he met the former in Heartland, leading to their clash. After clearing up the misunderstanding, Yuzu explained what she knows about Academia. The two were interrupted by nearby people who were referring them as Commons and both escaped. Yūgo explained that in City, there are two social classes: the poor is called Commons while the wealthy is called Tops. There also exist Riding Duel, a Duel that is done by riding a motorbike-like vehicle functioned as Duel Disk called D-Wheel. To promote peace between Tops and Commons, a tournament called Friendship Cup is held, and the one who continuously won will earn the right to challenge the Duel King, Jack Atlas. The two were chased by Security, a group functioned as the police force for Tops who will arrest any Commons from little to no reason at all. The member of Security, Duel Chaser 227 challenged Yūgo to a Riding Duel, which Yūgo accepted, and he easily won after summoning his ace monster "Clear Wing Synchro Dragon", and he and Yuzu successfully escaped. The Duel earned attention from the Director of Security, Jean-Michel Roget, who ordered for the Security to look and capture the two at sight. The next day, the Lancers arrived, but they got separated from each other. Yūya, Serena, Reira, and Shingo arrived at Commons area and were found by Security. Mistaking Yūya and Serena as Yūgo and Yuzu, they challenged them to a Duel. Overwhelmed by numbers, Yūya and the others were surrounded until they were saved by the arrival of Crow Hogan and his friends who allowed them shelter until they found the rest of their friends. However, when Serena and Shingo went out to duel people nearby to find potential allies, Security found and secretly followed them, leading to their capture together with Crow and his friend, Shinji Weber. Reira, however, was saved by Tsukikage before he could be captured. Meanwhile, Dennis and Gongenzaka were invited by a man named Gallager after he witnessed their Duel when the two tried to earn money while looking for the other Lancers. He took them to an underground Riding Duel where it turned out Shun was participating so he can earn the right to enter Friendship Cup, hoping to gain powerful allies against Academia. Shun and Dennis clashed against each other after a brief argument over their skills in Xyz summoning, and Shun started to get suspicious of Dennis' true identity during their Duel. Their Duel was stopped when Security raid the place and they were under arrest.

The Facility
Yūya and his friends were taken to a camp called the Facility, where they reunited with Gogenzaka and Dennis, while Serena and Shun were taken to solitary confinement on their first day: Serena taken there under Roget's order, while Shun after he got into a fight with other inmates. There, they learned that card functions as money, which means if they want to be treated nicely they have to give their cards to the guards as bribery, which explained why they were allowed to keep their cards. Yūya and the others earned the attention of the Facility's "boss", Chojiro Tokumatsu, who demanded them to give them their cards to him if they want to live in luxury. Refusing to do his biding, Yūya challenged him to a Duel to remind him how Dueling is supposed to be fun for everyone, a feat that Yūya succeeded. A few days later, Crow, Shinji, and their friends decided to stage a jailbreak by using the Grand Entertainment Duel that Tokumatsu will hold with Yūya and Shingo as diversion. Not wanting to trouble Yūya and his friends who may got blamed and punished for helping them escape, Crow acted cold towards Yūya so he won't be punished if they escape, which upset Yūya. During the Duel though, the Lancers finally able to convince Crow to let them escape together. With Tokumatsu and other inmates help distracting the guards, they succeeded getting out of the Facility, but now facing against the Arrest Corps. Shun, who was able to escape by himself, saved Yūya and the others who got cornered while trying to escape, while Dennis succeeded in freeing Serena. They regrouped with Crow and the others, and when it seemed they successfully escaped from the corps, they got caught by Roget who turned out to have lured one of Crow's friend into a trap. Before they can be taken back to the Facility, the Executive Council of City asked for the escapees to be taken to them.

Reiji turned out to have already explained the whole situation to the council regarding the reason of Lancers' arrival and Academia's incoming invasion. To prove their worth as allies, the council tasked them to enter Friendship Cup where their skills as Duelist will be tested. Following this decision, Roget suggested for Yūya to Duel Jack in the tournament's exhibition Duel. Initially refusing to participate, Yūya reluctantly agreed after learning that Yuzu also participated in Friendship Cup, having been registered by Yūgo who thought it would be easier for her to warn of Academia's invasion.

Exhibition Match
Yūgo and Yuzu went to the stadium to watch the exhibition match, and was surprised to find Yūya will be Jack's opponent, which was confirmed when Yuzu's bracelet was blinking and Yūya performed Pendulum Summon. Yūya, offended when Jack declared that he will be defeated in 3 turns, inadvertently let himself being played into Jack's hands. He tried to finish Jack with OTK by summoning "Dark Rebellion Xyz Dragon" and "Rune-Eyes Pendulum Dragon", but Jack activated his trap card to end the battle phase right before Yūya can deliver the finishing blow and counter attacked by summoning his ace monster, "Red Daemon's Dragon Scarlight", which easily defeated Yūya in the third turn like Jack has planned. Before his defeat, Jack told Yūya that his Dueling wasn't entertainment, but was merely for self-satisfaction, which Yūya took as an insult of the Dueling he inherited from his father.

Round 1, Day 1
On the day of the first match, the matches consisted of Gongenzaka vs. Crow, Shinji vs. Tsukikage, Yuzu vs. Tokumatsu, and Serena vs. Tony. Reira was supposed to Duel Shinji, but his refusal to Duel the latter after he gave him candy prompted Reiji to order Tsukikage to replace Reira. While the match proceeded, Tokumatsu and Yūya learned from a rumour that those who lost in Friendship Cup will be sent to an underground labour camp and will never able to get out. The first day of the matches resulted with Crow, Shinji, Yuzu, and Serena winning their matches, though Tsukikage purposely lost under Reiji's order.

Round 1, Day 2
On the second day, the matches consisted of Yūya vs. Duel Chaser 227, Yūgo vs. Shingo, Sergey Volkov vs. Damon, and Shun vs. Dennis. After winning his Duel, Yūya experienced a phenomenon of his mind synchronising with Yūgo during his match against Shingo through their respective dragons, resulting Yūgo to adopt Yūya's Dueling style and mannerism. After Shingo got sent to the underground labour facility where he regrouped with Gongenzaka and Tokumatsu, Gallager, who turned out to be running the place revealed there was a rumour that Roget is from another dimension since he was the one who introduced adding Solid Vision with mass technology when he suddenly appeared in City. He further explained that Roget was gathering strong Duelists for unknown purpose. Hearing this information, Tsukikage secretly went back to the surface to inform Reiji. After the match between Sergey and Damon, which won by Sergey, the next Duel pit Shun and Dennis against each other. Suspecting that Dennis is an Academia agent based on his skill in their previous Duel, Shun set a trap to force Dennis revealed his true allegiance. Shun succeeded in exposing Dennis' true identity by making him reveal the "Fusion" card on his hand, leading Dennis to summon the "Antique Gear" monsters, the same monsters used by Obelisk Force. With his cover blown, Dennis change his Dueling style to be violent and provoked Shun by revealing that he was partly responsible in Ruri's capture, being sent to Heartland to find her and green lit the invasion once he found her. The enraged Shun mercilessly attacked Dennis, defeating him. He attempted to turn him into card, but Reiji has tampered with his Duel Disk, disabling the function, and Dennis was taken away. When Dennis was taken away, there was friction between the council and Security over who will take Dennis into custody, but Sora saved Dennis and sent him back to Academia. Dennis' real allegiance also caused different opinions between the Executive Council and Reiji, making them considering not to accept Reiji's proposal to form alliance and instead tried to find a way to negotiate with Leo. However, Roget also decided to enact his plan, King's Bandit, which is taking control over the whole Security by controlling their minds through the chip planted inside their heads. He then ambushed the council and Reiji and held them captive until the Friendship Cup ends.

Round 2, Day 1
The matches of the second round consisted of Yuzu vs. Sergey, Yūya vs. Shinji, Shun vs. Crow, and Serena vs. Yūgo. In the first match, not only Yuzu got defeated, her D-Wheel was crashed by Sergey, sending her flying and his nearby building, horrifying Yūya and the others who were watching. Fortunately for Yuzu, she was saved by Sora before the Security could get her. The Duel caused Yūya unable to concentrate until Sora showed Yūya Yuzu's helmet that proved Yuzu was safe, allowing Yūya to focus and win the Duel. Unfortunately, since Shinji who got defeated was seen as a symbol for Commons after encouraging them to fight back, Roget used this as an opportunity to make it seems Yūya and the Lancers was on Tops' side, causing Shinji and Crow to think that Yūya was a traitor. Yūya escaped from Duel Palace to meet Sora who revealed that he intended to exchange Yuzu with Serena to the Professor and asked Yūya and Yuzu not to involve themselves with the inter dimensional war again, revealing that he truly cherish both of them as his first friends. Yūya refused, however, pointing out that Academia will invade Standard Dimension once the Professor find out of what he done if they do as he said. They were interrupted by Security's arrival. Yūya pushed Sora away and let himself be captured so Sora can protect Yuzu. Meanwhile, the children who lived with Crow, Frank, Amanda, and Tanner, found Yuzu and decided to take her to watch the match. Yūya was taken to Roget's office where Roget tried to win over Yūya by telling him how he used to be an agent of Academia and Sora will eventually betray him. At the same time, the match between Shun and Crow began. The two initially hostile towards each other, Crow believing the Lancers in league with Tops, while Shun became distrustful of everyone after Dennis' betrayal. The two Duelists soon found they have many things in common after Shun saved Tanner, who fell from his place while watching the Duel, changing the impressions between them. The Duel ended with Crow's victory and friendship formed between him and Shun. Seeing this unfold, Yūya decided to trust Sora and declined Roget's offer for alliance, causing him to be taken away and imprisoned.