The original episode will serve as a bridge between the second and third season.

Upon the conclusion of the Vanguard High School Koshien, Kouji Ibuki begins to have new nightmares. Nome Tatsunagi has Suiko summon him to the mansion where they learn he can see a Dark Tower called Sanctuary. Sanctuary is causing the timeline to be altered throughout history, and the only way to correct it is for Kouji to first correct his future mistake. Now Kouji and Suiko must travel the parallel world -if- and watch as Magical Girls Emi Sendou and Shuka summon Vanguard units to help correct history. Sadly the two can't help much as Cardfighting against real monsters doesn't do much good. (Source: ANN)

Cardfight!! Vanguard features a world where the game Cardfight!! Vanguard is becoming the latest craze among trading card games, becoming a part of everyday life for people all over the world. The game is not limited to Earth alone; battles between the creatures used by the players take place on another planet called Cray. The story begins with Aichi Sendou, a timid middle schooler whose meek attitude often leaves him a target for bullies. Aichi was given a very rare card, "Blaster Blade", when he was very young. It's his one treasure that gives him hope. That is, until it gets taken from him. Although Aichi has never played Cardfight!! Vanguard before, he challenges the thief to a game in order to win the "Blaster Blade" back. This high-stakes game quickly draws Aichi into the world of Vanguard battles, which will test and change his worth as both a player and a person.

Episode 1: HLB HLB stands for "Hero League of Baseball"—it is a baseball league founded by pro-heroes who love baseball! It's game day! The last game of HLB championship is between Gang Orca and Shishido's two rival agencies. They form a team ("Orcas" and "Lionels") to compete. In the world of HLB, there is no rule—using their Quirks is of course accepted; however, just when the game is about to finish, they are interrupted by a villain. Who will be the winner of HLB?! Episode 2: Laugh! As if you are in hell Deku, Bakugo, and Todoroki participate in an internship under the No.1 hero, Endeavor's agency. One of their tasks these days is to find a villain ("Smiley") who draws doodles in the city; however, since the urgency is so low, they let other pro-heroes solve this case. One day, Smiley draws a doodle on Endeavor's house! Being furious, Endeavor himself and the 1-A trio go out to get the villain' however, Smiley's Quirk turns out to be something ridiculous but powerful... It is to make anyone who looks into his eyes laugh hysterically! Can the team capture the villain and stop laughing?!