Things have calmed down considerably since the defeat of Talpa.​ Sage has gone off to America to study; Ryou is celebrating his birthday; Kento's won the lottery! However,​ the joyous mood disappears when the local news breaks a story about a strange killer in New York wearing mysterious armor.​ When the four warriors arrive to investigate,​ they are met by a new sinister force.​ The ancient sorcerer Shikaisen has discovered the power of the armors and is now intent on making them his own. 
 
(Source: Bandai Entertainment)

Thousands of years ago, the evil emperor Talpa attempted to conquer the Earth. Defeated, he was banished to the Nether Realm and his armor was divided into 9 separate suits. Now, he has returned to conquer Earth, having reclaimed 4 of the suits. The other 5 are in the possesion of those who are the only hope of stopping him: The Ronin Warriors. 
(Source: Anime News Network)

A strange, silent warrior appears. When the Inferno armor is summoned to battle him, the mysterious warrior calls forth his own armor &ndash;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)

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