SHADOW SKILL: Kurudaryuu Kousatsuhou no Himitsu

In a warrior kingdom, a martial art known as Shadow Skill is used to protect the realm. Gau Ban, a young boy inspired by the legendary Scar Face—who has bested 2,000 foes—trains under his older adopted sister, Elle, who is proficient in Shadow Skill. When a group of intruders attacks the castle to seize a box holding a secret, intense combat ensues.