A strange, silent warrior appears. When the Inferno armor is summoned to battle him, the mysterious warrior calls forth his own armor a black copy of the Inferno armor! Now, the warriors will find themselves half a world away fighting once more to save humanity, but this time, from their own armor! (Source: AniDB)
Watch Ronin Warriors: Legend of the Inferno Armor episode 1 online — subbed and dubbed, with automatic AniList / MyAnimeList progress sync.