Source taken from AniDB.net/Wikipedia.org
Shadow Skill (SHADOW SKILL, Shadō Sukiru?) is a manga series with anime adaptations, produced 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. Shadow Skill is a shōnen series which features Styles of combat, such as martial arts.
In addition to having a 26 episode television series three separate OVAs were made which have been released in the United States by Manga Entertainment. The television series, which has a different storyline to that of the OVAs, is distributed by ADV Films.
