Shadow Skill (シャドウスキル －影技－), is a manga series with anime adaptations, created by Studio Deen and aired on Japanese Television in 1998, and has been released in the United States by ADV Films in 2005. The series is based on the manga by Megumu Okada. A shonen series, it features a lot of combat, especially martial arts.

The main protagonists of Shadow Skill are Elle Ragu, the 59th Sevalle in the kingdom of Kuruda, and Gau Ban, an orphaned boy that Elle takes up as her adopted brother. He is currently a Valle and is improving his training. Gau is so impressed by Elle's fighting skill, and the stories of Kuruda's greatest fighter Scarface, that he is studying Elle's fighting skills so that one day he would become the greatest Sevalle in Kuruda. But before that, they must face demon beasts, spies, and Elle's debts from drinking, and collateral damage from fighting.

Also in Elle and Gau's life is Faury Maya (Folli Maya in the TV series), a Sui Rame talisman sorceress, and Kyou Ryu, a Septia beastcatcher and niece of Iba Stora, the king of Kuruda.

The series tackles a world which is under Tokyo's underground railway system aptly called the Underground. The people living there are called Elemental Users because they can manipulate various elements.

When the Priestess of Life, Ruri Sarasa, and her bodyguard, Gravity User Chelsea Rorec escape to the surface and take refuge with swordsman Asagi Rumina and his bespectacled best friend Isuzu Ginnosuke, the lives of the two boys are never the same after Rumina was killed during a battle with a henchman then resurrected by Ruri.

They find out that Ruri is a very important person in the Underground and is being pursued by evil powers there. Grateful for Ruri and his newfound Wind powers, Rumina vows to protect her, even if it means going to the Underground to rescue her from her eventual captors before she gets sacrificed.