Ice, space, power, and wind. A continent guarded by witches who inherited the four great magic stones. When the seventh generation, inheritor of "Wind," dies, a summons is issued to select a successor, and the candidates gather at Winfred Academy. The disaster "Erosion" spreads. And then there's Anzu, a boy who conceals the power of his cursed blood. Who did the wind choose? The story of Anzu, a boy drawn by the wind and living his life along with it.