Agnes Flarebit. The most powerful demon slayer on earth. It is said that he is often fully clothed in armor, so few have seen your face. Doesn't show much emotion, and yet the little she does show is very revealing. Truly good of heart....

Only monsters lived on the world of Arc Earth. That is, until the advanced civilization of humans came and colonized it for themselves. His country and his world in wreckage, Prince Evil of the Demon Kingdom fought back against the human invaders...