Yoroiden Samurai Troopers Kikoutei Densetsu
English title: Ronin Warriors Legend of Kikoutei
Japanese title: 鎧伝サムライトルーパー輝煌帝伝説
Type: OVA
Episodes: 4
Source: Original
Genres: Adventure, Fantasy
Studios: Sunrise
Duration: 26 min per ep
Rating: PG-13 - Teens 13 or older

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)