The story is set several months after the events of the second season, Cardfight!! Vanguard: Asia Circuit Hen. The main character, Vanguard card game player Aichi Sendō, is now about to enter high school. He enrolls in the elite Miyaji Academy, but unfortunately, his rivals-turned-friends Katsumi and Yūta are going to a different school.
While his first days at high school are lonely, Aichi gets some advice from his friends Toshiki and Taishi at the Card Capital shop. To make the most of high school, Aichi forms a Cardfight club for Vanguard players. He makes new friends (as well as new rivals), and he juggles card-playing with sports meets, cultural festivals, tests, summer vacation, and everything else that high school has to offer.
