The Sacred Blacksmith (Dub)
At some point in time, Dubs received the Breath of Bless from the Supreme Deity along with Dahlia. They are first seen attacking the Demon Realm in the Demon King and his sons' absence, and massacred large numbers of Demons, while letting one escape. They then take over the Demon Realm and dispersed the dark miasma and replaced it with an ominous light.
This leads to her almost being overwhelmed in a battle, if not for the timely intervention of a blacksmith named Luke Ainsworth. Ainsworth wields an incredible katana, the likes of which Cecily has never seen before. After being saved by him on multiple occasions, she becomes enamored with him and yearns to learn more about the standoffish warrior, as well as develop her own skills to match his.
Once upon a time, there was a tragic war, in which the power of the devils was involved. After the war, the devils' power was banned and the world was restored to peace. Cecily Campbell is a knight, who has been looking for a blacksmith to repair her old sword given by her father. One day, she saw a man fighting with a ruffian who used the tabooed devil's power. The man defeated him with one blow of his weirdly shaped sword. The man turned out to be a blacksmith called Luke. The fateful encounter was the beginning of the adventure.