In Yu-Gi-Oh, but Mechanical Ascension (1-148).

Summary

You Feng experiences a surprise moment when the system announces a special bonus reward due to the power of Synchronicity. He opens a card pack and receives the "Future Mecha" card set, including a powerful LINK-6 level monster, the Electronic Realm Arriver @ Fire Spirit Celestial. Excited, he organizes his deck and receives an email from Bei Ka Si about LINK summoning progress and an invitation to design LINK cards. A system task prompts him to use a new LINK deck in a duel, leading him to consider maximizing spirit power through card games. Meanwhile, the Duel Academy is buzzing with duels, and Professor Cobra observes a surge of energy linked to You Cheng Shi Dai. As chaos ensues in Cobra's secret lair, You Feng and his friends confront him, leading to a duel where You Cheng Shi Dai steps forward to battle Cobra, while You Feng watches the mysterious golden energy entity with intrigue.

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