The Cardfight Club is forced by the Miyaji student council to take the main stage on the day of the academy's upcoming School Festival. The student council hopes to use this chance to embarass the club and tarnish its reputation. Despite the daunting task, the club decides to do a stage play using one of Shingo Komoi's prewritten scripts and with costume help from Emi and Mai. The script is loosely based on The Tale of the Bamboo Cutter but with Vanguard characters; Aichi is given the role of the bamboo cutter (Little Sage, Marron), Misaki is the heroine (CEO Amaterasu), Naoki Ishida is the villain (Eradicator, Vowing Sword Dragon), and Kourin is the hero (King of Knights, Alfred). Although Kourin is seemingly busy with her job as an idol, Misaki notices that she is in fact preparing for the play. However, on the day of rehearsal, Kourin does not show up, which leads the club (except Misaki) to think that she is not serious about the play and that Aichi should take the role of Alfred.
The day of the School Festival finally arrives, and all of Aichi's friends have come. Unfortunately, Kourin is not at school. To make matters worse, the club is informed by Suwabe that the club's time of performance is actually an hour earlier than scheduled. As the club hastily sets up for the play, Misaki learns from Akari why Kourin did not show up for rehearsal. The play then goes underway with Shingo narrating the story. But when the time comes for Kourin's scene, Naoki accidentally destroys the set and his costume, causing the audience to grow angry. Before the play is totally ruined, Kourin appears in her costume and saves the show when she declares a new adversary for her to fight: the legendary fighter Daigo.