CARDFIGHT!! VANGUARD EXTRA STORY -if- - S01

After the Vanguard High School Koshien ends, Kouji Ibuki starts experiencing strange new nightmares. Nome Tatsunagi sends Suiko to bring him to her mansion, where they discover he can see a mysterious Dark Tower known as Sanctuary. This tower is distorting history by altering the timeline, and the only way to fix it is for Kouji to undo a mistake he hasn’t even made yet. Together with Suiko, he journeys into the parallel world "if," where they witness Magical Girls Emi Sendou and Shuka summoning Vanguard units in an attempt to restore history. Unfortunately, their efforts don’t amount to much-cardfighting against actual monsters isn’t very effective.