After the Vanguard High School Koshien concludes, Kouji Ibuki is plagued by fresh nightmares. Nome Tatsunagi summons Suiko to the mansion, where they discover he can perceive a Dark Tower known as Sanctuary. The tower is distorting history across time, and the only way to restore it is for Kouji to first amend his future blunder. Thus, Kouji and Suiko must journey into a parallel world—if possible—and observe Magical Girls Emi Sendou and Shuka summoning Vanguard units to repair history. Unfortunately, they cannot make a significant impact for the cause, as card battles against actual monsters prove largely ineffective in the face of this challenge.
