No matter how hard humanity had tried there would always be a line that separates them and us. Some call them 'Demons' others 'Monsters' a few have even called them 'Angels' but over lifetimes everyone has come to terms with Devil Walkers. And meet the main protagonist(and love interest.) Tsunayoshi Sawada or as people call him Dame-Tsuna a person with a Unknown Aura. But if he's so Dame why won't the Devils leave him along?