第 4 集: 學生會鎖定卡片戰鬥俱樂部，足球隊長挑戰愛知
Tatewaki Naito, the student council chairman of the Miyaji Academy High School Division, deems Aichi's Cardfight Club to be unnecessary for the school and orders the vice-chairman, Itsuki Suwabe, to devise on how to abolish it. Elsewhere, the Cardfight Club finds an empty classroom to serve its official headquarters. Then, the school's American football team, the Miyaji Vipers, barges in and takes the club outside to the academy's sub-ground where the Vipers' quarterback/captain, Kongou "the Catapult" Ikki, challenges Aichi to a cardfight, with the former appropriately using a Spike Brothers deck. This is an elaborate plan set up by Suwabe to have Kongou defeat Aichi and thereby crush the Cardfight Club members' spirits into not wanting to continue the club. Kongou uses strong Limit Break effects of the latest Spike Brothers to push for victory, but Aichi successfully defends and makes it to his next turn. Aichi then utilizes both the Break Ride of Solitary Liberator, Gancelot and the Limit Break of Liberator of the Round Table, Alfred to overpower and beat Kongou. This loss causes the football team's female cheerleaders to dump Kongou and the Vipers, which devastates them. Later, Naoki asks Kongou's motive for challenging the Cardfight Club, to which he answers that while he was bribed by the student council with a bigger budget for the football team, he mainly did it for the sake of playing against a strong cardfighter like Aichi. The Vipers then take their leave, and the Cardfight Club is more motivated to find a fifth member to have the club become official before the student council acts again. (Source: Wikipedia)