Magician of the Depths

A long time ago, in a world where sorcerers were annihilated by a monster, Kunimi and Chisayo are orphaned brother and sister picked up by feudal manager Hyukenai and put to work under him. One day, after Chisayo suffers a cruel punishment, Kunimi decides they should run away. But during their attempt they are swallowed by a large crack in the ground... ~Rei