The geme of shadow

Long ago, there was a man from Japan, who was very strong, no one could beat him, every strong fighter who faced him, ended up being defeated, but one day he decided to go deep into the desert, looking for the secret of absolute power, until he came to an ancient castle, and activated the power of the shadows, such power drained all his humanity, drained his soul, until there was only... a shadow... the man stood up and raised his face, in front of him were the greatest warriors in the entire world, a very grand vision! Now he had someone to face! And that legendary fighter called shadow... It's you. After that, you went to your old master so he could teach you how to control such power of the shadows.