In a war torn world of deadly conflict, one small group of heroes stands against the forces of darkness, armed only with two weapons&mdash;their unswerving dedication to good and the superhuman martial art known as the Shadow Skill...
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(Source: Anime News Network)

Gau Ban is a boy who is struggling to become a "Sevalle," the strongest class of warrior in the mercenary kingdom of Guruda. Gau's elder sister, Elle Rag, is the 59th "Sevalle" and holds the honorable title of "Shadow Skill." The story develops around the two siblings, as they fight magical monsters and historical warriors. The major part of it is a battle called "Shadow Skills" that is fought with only the hands and feet. It begins when the historical warriors chant the words "We are invincible!" and obtain superhuman powers.


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.
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(Source: Anime News Network)

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. 

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