Ginsekai no Shoumei

Alza lives alone on a desolate snowy plain. One day, Leah, a sorcerer from the magical city collapses near his house. Alza forbids Leah from using magic in his presence and shows her how beautiful life can be outside of the magical world. But, why does Alza hate magic, how did Leah get outside the magical city, and what will happen when Leah returns home?