Yoroiden Samurai Troopers Gaiden  

Legendary Armor Samurai Troopers: Gaiden, Ronin Warriors Gaiden, Ronin Warriors OAV, Samurai Troopers OVA 1, 鎧伝サムライトルーパー外伝

Despite their victory over Talpa, the Warriors are not given much time to rest as they celebrate Ryos birthday party. However, their celebration is interrupted by news of a killer in samurai armor causing chaos in New York City. The armor bears an eerie resemblance to something they have seen before. Now, they must face off against the ancient sorcerer Shikaisen in order to save Sages life.