SHADOW SKILL: Kurudaryuu Kousatsuhou no Himitsu

In the land of Kuruda, warriors with magical powers and incredible fighting skills battle for the ultimate prize: the title of Sevaar, the strongest warrior in the land. Elle Ragu, nicknamed Shadow Skill, is the newest Sevaar to emerge, but that doesn't make her life any easier. Teaching her "little brother," Gau, how to be a warrior, fending off assassins from other kingdoms and thwarting enemy invasions is hard enough, but her biggest challenge will be paying off her drinking debts.

In a war torn world of deadly conflict, one small group of heroes stands against the forces of darkness, armed only with two weapons—their unswerving dedication to good and the superhuman martial art known as the Shadow Skill...

In this OVA, the story of Gau's history with his adopted sister and the secrets that make up the shadow skill unfold. The pair make their annual return to the gravesite of Gau's parents, where his growth and progress as a warrior can be exhibited for them. Gau has come along way in his training as a Sevalle under Elle's mentorship, but there are those who wish to find a way of eliminating them, just waiting for the right opportunity to mount a deadly attack. As the travellers make their journey, their family bonds and skill will be tested. Opponents are many, and battles are fierce, but Gau's training also entails taking on his sister in battle, and fully embracing the skills he must learn to defeat his ultimate opponent.

Shinjuro may be a little young to be the master of a swordsmanship school, but fate didn't give him a choice. Now his position and martial arts skill land him in the middle of serious trouble when the rogue samurai Mikage faces off against the Tokugawa government, and Shinjuro and the small group of swordsmen who train at the school must now protect the town from harm. However, the group won't be challenged until the Tokugawa house calls in a favor, and the young swordsman is forced to duel Mikage himself.