Meet Y/N, a girl who loves playing the card game yugioh. But one day, she gets sent to the world of Yugioh 5Ds as the granddaughter of Cure Scarlet aka Akagi Towa. She bears her grandmother's key along with her fellow friend's key as well. But while enjoying her new life, she gets invited to the fortune cup to duel the top and best duelist in the world. What kind of duel are waiting for Y/N?