Cardfight!! Vanguard

Miwa spies on Kai who has begun fighting in underground fights in order to find stronger opponents. Underground card fights usually result in the loss of cards, and players do not abide by the rules that ensure fair play in a cardfight. When Miwa discovers that Kai is searching for Jun, the King of Underground Fights, he goes looking for him. He confronts Jun, and is captured. Jun and Kai then have a cardfight with Miwa and Kai's freedom at stake.