Saint Seiya: Meiou Hades Meikai-hen
English name: Saint Seiya: The Hades Chapter - Inferno
Genres: Action, Adventure, Fantasy, Sci-Fi
Type: OVA, Episodes: 12
Aired: Dec 17, 2005 to Feb 6, 2007
Studio: Toei Animation
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
Seiya and the rest of the Bronze and Gold Saints who have survived the Sanctuary battle have entered the world of the Dead. They are fighting to get to Hades and defeat him. 

(Source: ANN)