The Hard Shells are secondary antagonists in the 1990 PC88 action visual novel "Battle Skin Panic: Zenra Senshi" (バトルスキンパニック -全裸戦士-) by developer Gainax, as well as the enhanced ports "Super Battle Skin Panic" and "Battle Skin Panic 9821". They are members of an underground-dwelling people called the Mastodon Race (マストドン人).
A species that has been around for thousands of years, the Mastodons and their queen, Mothylsu, were defeated by the Chinese Princess Taketoyo, who was the creator of the self-defense art: "Hadaka Kami Kassatsu" (裸神活殺).
In the late 20th century, the Mastodons begin abducting young girls near Tibet to drain their blood in order to resurrect Mothylsu. However, this alone does not work. The presence of a powerful relic, the "Blue Lob Star" (ブルー・ロブ・スター), is also needed.
One of the Mastodons, referred to as "Hard Shell-E", murders the Master of protagonist Mimi Bandou, only to then discover that he no longer has this relic. She later manages to track down Mimi and steal it. The hero party manages to learn the entrance to the Mastodon's underground world, where they then battle and kill the Hard Shells in their path, and ultimately, the resurrected queen.
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Full gallery: Hard Shells (Battle Skin Panic)