‘Shadow Skill’

The warrior kingdom of Kuruda is home to the fiercest fighters in the world, men and women who live solely for the chance to fight, and become the greatest in the world. And no one is so intent on this goal as the young Gau Ban, who dreams of becoming a new generation of warrior. He and his adopted sister Elle, their companions, and the legendary Scarface train and battle for the mastery of the Shadow Skill.

Descriptions taken from AniDB.net