Kinuyu Yuu is a 15-year-old boy who lives in Kanazawa City, Kaga Province. He is in the third grade of junior high school. Yuu has the ability to see into other people's hearts, but he is troubled by his personality that he can't say no when asked. One day, Yuu, who was asked to cater to the interests of his sisters, ran out of the house because he couldn't stand it anymore. It was Okura Megumi who saved Yuu. Megumi invited Yuu to the night amusement park "Wanda Hill" where his friends are based. Megumi, Ishikame Zakusa, and Seto Fuyuki, who gathered at the amusement park, are members of the "blackout" who will enjoy the Vanguard all night. And tonight, the captain of the Black Vision Team, Momoyama Danji, and the powerful fighter Ebata Toruya, who is wrapped in mystery, will be fighting a real battle with the team flag. Under Yuu's gaze, the card battle was swallowed up by the world of imagination without knowing it. Yuu met the Vanguard in this way, and he was deeply attracted by the charm of the game, the world he had never seen before, and his friends.