Yu-Gi-Oh! ARC-V (Season 1)

Standard Dimension Arc is the first story arc of Yu-Gi-Oh! ARC-V anime series. It follows Yūya Sakaki from You Show Duel School who discovered a new summoning mechanic called Pendulum Summon, working hard to develop the new summoning method and become a professional Entertainment Duelist by participating in Maiami Championship. In the midst of this, he and his friends started to learn of the existence of other dimensions and got involved into inter dimensional warfare.

Discovery of Pendulum Summon
While training at You Show Duel School with his childhood friend Noboru Gongenzaka, which got interrupted when his another childhood friend, Yuzu Hīragi, accidentally broke the Solid Vision system, Yūya was visited by Nico Smiley who offered him a chance to Duel the current Duel Champion, Strong Ishijima. This initially upset Yūya since it reminded him of his father's, Yūshō Sakaki's, disappearance on the day his father was supposed to Duel Ishijima, and was deemed a coward who ran away by others as the result. But Yūya eventually agreed so he can clear his father's name.

On the day of the Duel, Yūya put up a good performance for the half of the Duel until Ishijima managed to counter Yūya's play, pushing Yūya to a corner and making him lose hope until he remembered his father's words, regaining the courage to continue. Suddenly, his pendant reacted with three of his Effect Monsters - "Stargazer Magician", "Timegazer Magician" and "Odd-Eyes Dragon", transforming them into Pendulum Monsters, while "Odd-Eyes Dragon" was transformed into "Odd-Eyes Pendulum Dragon". Using his his new monsters to support "Odd-Eyes Pendulum Dragon," he wiped out Ishijima in a single attack, winning the Duel. Afterwards, he was swarmed by people asking about the Pendulum Summon that he'd performed, though he seemed unaware of the details himself and didn't seem to remember exactly what had happened.

Yūya initially got a warm reception until he discovered that Pendulum Summon can only be performed by using Pendulum Monsters that only Yūya has, leading people who initially wanted to apply to You Show Duel School to think that Yūya was cheating when Dueling Ishijima and left. However, one boy, Tatsuya Yamashiro, still decided to apply out of admiration for Yūya.

The  Pendulum Summon  that Yūya performed earned him many attentions from other Duelists; The president of  Leo Corporation ,  Reiji Akaba, who since then began to observe him closely: Shingo Sawatari, a student of Leo Duel School (LDS) who once stole his Pendulum Monsters: and Sora Shiun'in, a boy who developed admiration towards Yūya and initially demanded to be made his apprentice.

You Show Duel School vs. LDS
While on their way home from shopping, Yuzu noticed and overheard Shingo wanting to get revenge on Yūya, so she confronted him to teach him a lesson. However, before the two can commence Duel, a mysterious masked Duelist suddenly barged in and took over the Duel in Yuzu's place. The Duelist, an Xyz user, has an ability to produce shockwaves even though they were not on Action Field. He easily defeated Shingo with his ace monster, "Dark Rebellion Xyz Dragon" and was revealed to have identical face with Yūya, leading Yuzu, Shingo, and the others to mistook him as Yūya. The Duelist suddenly disappeared when Yuzu's bracelet suddenly shined just as Yūya arrived, oblivious of what she meant when Yuzu inquired him.

Following the incident, Reiji's mother, Himika Akaba, used this as an opportunity to take over You Show Duel School by accusing Yūya as Shingo's attacker based on Shingo and his lackey's exaggerated testimony and Yuzu as the eye witness, though Yuzu decided to trust Yūya in the end. Knowing Himika's real intention to add You Show Duel School to LDS, Yūya and his friends accepted Himika's challenge for a three vs. three Duels. Yūya, Yuzu, and Gongenzaka represented You Show Duel School, while Hokuto Shijima, Masumi Kōtsu, and Yaiba Tōdō represented LDS.

The Duel resulted with each school has one win, one lost, and one draw, so Himika proposed a tie breaker Duel between Yūya and Masumi who won their Duels, but instead of Masumi, Reiji took over the Duel against Yūya. Reiji proved to be a formidable opponent for Yūya due to his mastery of all Summoning methods, including Pendulum Summon. However, the Duel came into abrupt stop when Reiji left after he received a report there was another attack on LDS, giving the victory to Yūya.