Once upon a time, a selfish king summoned the monstrous Bulkirin into the real world. The monster killed half of all human beings, leaving the rest helpless as to what to do. That is, until one day when a hero appeared and defeated the Bulkirin with the legendary Seven Blade Sword. But what does this have to do with eighth grader Eun-Gyo Sung? After being suspended from school for fighting, she runs away from home, and then gets kidnapped by a mysterious stranger.