Yoroiden Samurai Troopers Gaiden / 鎧伝サムライトルーパー外伝

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)...