Yoroiden Samurai Troopers Gaiden
Plot Summary: 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!
Other name: Ronin Warriors Gaiden, Ronin Warriors OAV, 鎧伝サムライトルーパー外伝