This OVA reveals Gau's history with his adopted sister and the secrets behind the shadow skill. The pair make their yearly visit to the gravesite of Gau's parents, where he can demonstrate his growth and progress as a warrior to them. Gau has come a long way in his training as a Sevalle under Elle's mentorship, but there are those who wish to find a way to eliminate them, just waiting for the right opportunity to launch a deadly attack. As the travellers make their journey, their family bonds and skills 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.