The Guyver: Bio-Booster Armor is a oVA anime that premiered in fall 1991.

About the production: there are 6 episodes of about 30 minutes and its current status is "finished".

Its main genres are action, adventure, drama, horror and sci-fi, with themes such as Super Power and Male Protagonist.

On AniList, The Guyver: Bio-Booster Armor has an average score of 65%, a good score, and appears on 2,415 users' lists.

The franchise continues in or follows from: Kyoushoku Soukou Guyver (1989).

Sho and his friend Tetsurou stumble upon an odd alien artifact while walking through the woods. Then, the alien artifact breaks free of its metallic bonds and enters Sho's body, turning him into the Guyver. With this new power, Sho must do battle with the evil Chronos corporation and their genetically enhanced Zoanoids, who seek to get the Guyver back into their labs. No one close to Sho is safe from Chronos. He must fight. (Source: Anime News Network)

Official synopsis from AniList.