Bio-Booster Armor Guyver or simply Guyver is a Japanese manga series written and illustrated by Yoshiki Takaya. The Guyver itself is a symbiotic techno-organic device that enhances the capabilities of its host.

Kadokawa Shoten (角川書店), formerly the Kadokawa Shoten Publishing Co., Ltd. , is a Japanese publisher and division of Kadokawa Future Publishing based in Tokyo, Japan. It became an internal division of Kadokawa Corporation on October 1, 2013. Kadokawa publishes manga, light novels, manga anthology magazines such as Monthly Asuka and Monthly Shōnen Ace, and entertainment magazines such as Newtype. Since its founding, Kadokawa has expanded into the multimedia sector, namely in video games and in live-action and animated films.