The day after losing his memory, Kamijou Touma tries to return to normal life by buying reference books for school. As he tries to keep others from knowing about his memory loss, he continues living with Index, who now accompanies him on a trip to the bookstore. As he fights Index's urges to eat ice cream, he meets his friend Aogami Pierce "for the first time" and the eccentric boy showed his annoying first impression to Touma and Index, causing the latter to lash out on him.