High-school girls' Eri and Yuko have been suddenly summoned to the another world. It was the people of the small size character that called them. Somehow, they say that Eri and Yuko are "Majin" who save this world. Eri and Yuko were excessively expected, and they were completely at a loss. "We are commonplace girls who cannot be transformed and even cannot use magic. Nevertheless, why?"