I believe you're referring to "Shaider" and its presence on the Internet Archive.
While the Internet Archive is a hub for preservation, much of the high-quality
Print Media: Some entries include scanned Japanese magazines and hero books that provide behind-the-scenes photos and character designs. Why It Is Used
8. Conclusion: Visit the Archive Before It’s Gone
The Internet Archive is currently facing legal and funding challenges. The Shaider collection is a fragile digital time capsule. As fans say in the show: “Shakure!” (Strike!)—take action now.
The Internet Archive hosts a comprehensive collection of Uchuu Keiji Shaider