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: MyAnimeList
Other anime produced by Toei Animation.
Availability may vary by region.
Megami no Senshi ~Pegasus Forever~
Takusu mono he
Other anime that aired alongside Saint Seiya: The Hades Chapter - Inferno.
