CARDFIGHT!! VANGUARD EXTRA STORY -if- - S01

When the Vanguard High School Koshien ends, Kouji Ibuki starts having new nightmares. Nome Tatsunagi has Suiko call him to the mansion, where they learn he can see a Dark Tower called Sanctuary. Sanctuary is changing the timeline throughout history, and the only way to fix it is for Kouji to correct his own future mistake first. Now Kouji and Suiko must travel to the parallel world "if" and watch as the Magical Girls Emi Sendou and Shuka summon Vanguard units to help set history right. Unfortunately, the two can't do much, since cardfighting against real monsters doesn't help very much.