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Move over, solitaire! Cardfight Vanguard is the card game that all the kids these days are playing. Using carefully prepared decks, players battle it out for fame and glory – the first to receive six damage points loses. After a bully takes Aichi's special card, the boy learns Vanguard to win it back and finds himself inexplicably drawn into the sport. Now determined to prove his skills to himself, as well as to the legendary player Toshiki Kai, Aichi climbs the ranks of Vanguard, making new friends and challenging fierce competitors along the way.
In the underbelly of society, "Dark Games" are used to settle disputes between opposing organizations of the underworld. Tohru Kageura, a strange boy who possesses a special ability to "see" the Death Deity, is forced to participate in a Dark Game of Buddyfight to pay off his late father’s debt. However, the consequences of losing a Dark Game are a lot more deadly than a normal card fight – one that could cost the player his life!
Humans intermingle with beings from the parallel world of "Shinkinkai." The "Buddyfight" game chooses humans ("Buddyfighters") and partners them with Buddy Monsters from Shinkinkai, and the duo fight against other Buddyfighters. The battles in these games can sometimes even influence the fate of nations. Gaō Mikado is a sixth-year student at the "Aibo Academy" elementary division who longs to be a Buddyfighter and to be partnered with a Monster. One day Gaō notices a young boy being bullied by delinquents, and he helps him out using his Aiki-jujutsu skills. Drum Bunker Dragon, a Monster and the son of the hero of Dragon World, watches Gaō's actions, and decides to form a pact with him as his buddy.