Shadow Skill (1996)
English name: Shadow Skill: The Movie
Genres: Adventure, Drama, Fantasy
Type: OVA, Episodes: 3
Aired: Sep 21, 1996 to Nov 21, 1996
Studio: Zero-G Room
Source: Manga
Rating: R - 17+ (violence & profanity)
Synopsis:
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... 

(Source: ANN)