Yoroiden Samurai Troopers Gaiden
English name: Ronin Warriors Gaiden
Genres: Adventure, Fantasy
Type: OVA, Episodes: 2
Aired: Apr 30, 1989 to Jun 1, 1989
Studio: Sunrise
Source: Original
Rating: PG-13 - Teens 13 or older
Synopsis:
Although Talpa has been defeated, the Warriors don't get much of a break. As they celebrate Ryo's birthday party, the news tells them of a strange killer in samurai armor wreaking havoc in New York. And the armor looks very familiar. Now, they will have to battle the ancient sorcerer Shikaisen for Sage's life!

(Source: AniDB)