Herlock Saga: Nibelung no Yubiwa
English title: Harlock Saga
Japanese title: ハーロック・サーガ ニーベルングの指環
Alternative titles: Harlock Saga: The Ring of the Nibelung - The Rhein Gold
Type: OVA
Source: Manga
Episodes: 6
Status: Finished Airing
Aired: Jan 25, 1999 to Nov 25, 1999
Duration: 25 min per ep
Rating: R - 17+ (violence & profanity)
Studios: Studio Z5, Studio March
Producers: Bandai Visual, Avex Entertainment, 81 Produce
Licensors: Central Park Media
Genres: Action, Adventure, Drama, Sci-Fi
Themes: Space
Demographics: Seinen

Captain Herlock is drawn into a saga of intergalactic proportions when the son of a deceased comrade unwittingly forges the Ring of the Niebelung. Evil forces gather to wage war against the last remaining superpowers of the galaxy led by a demented outcast. Herlock must counter the amassed armadas that threaten the last gods and recover the ring before Paradise is lost. 

(Source: ANN)