Yoroiden Samurai Troopers Gaiden
English title: Ronin Warriors Gaiden
Japanese title: 鎧伝サムライトルーパー外伝
Type: OVA
Episodes: 2
Source: Original
Genres: Adventure, Fantasy
Studios: Sunrise
Duration: 25 min per ep
Rating: PG-13 - Teens 13 or older

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)