Weiß Kreuz OVA
English title: Knight Hunters OVA
Japanese title: Weiß Kreuz ヴァイスクロイツ
Type: OVA
Episodes: 2
Source: Unknown
Genres: Action, Drama
Studios: Triangle Staff, animate Film
Producers: Marine Entertainment
Duration: 30 min per ep
Rating: R - 17+ (violence & profanity)

Someone out there is determined to see the fall of Weiss Kreuz, and it looks like they have found the perfect plan for it. The four assassins find themselves trapped in a deadly game of deceit, where the question of honor versus duty comes to surface. Now they must fight for their own reasons to survive--and there can be only be one victor in this field of death.

(Source: AniDB)