Defying The Heavens

AU. All legends and hero have a beginning. Some start as nobles or commoners. Issei, however, started in the worst way possible – as a slave. However, he will reach a level that no one else has ever reached. He will reach the very peak of martial arts, and become the most powerful being in existence. This is his story, and how he rose to prominence. IsseiXHarem! Xianxia-setting!