Mastria is a world full of strong warriors, people shape themselves through exploration of martial arts and refining their aura. A young man, Kiryu Shoto, set out to his absent father's hometown of Nisshoku City to discover his paternal family line while mastering the style he has learned from his mother. This journey has lead Kiryu into contact with a mysterious woman, a self proclaimed "angel" named Eva, whom Kiryu has caught the eye of. Eva desires to "manage" Kiryu as he combats many fighters in Nisshoku City and forms bonds with respectable warriors.