Demons exist and their power is beyond what humans can fathom. In fact they are so strong that humans do not stand a chance against them in a fight. The only thing strong enough to defeat a demon is another demon and it is trough this logic that Ryo Asuka hatches the plan to have his good-hearted friend Akira Fudo possessed by a demon. If a person is of pure of heart then he might be able to control the demon that posses him and thereby acquire power equal to a demon. After raising some hell in a club the plan works and Akira is possessed by the powerful demon known as Amon. Now Akira is humanities sole champion of justice against the hidden demon menace that has plagued humanity since the dawn of time. (Source: ANN)

The 13th episode of the TV anime bundled with the special limited first edition of the 7th manga volume.

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: ANN)

Following the original TV series, the story tells the efforts of Momiji Gakuen, Chacha's rival school principal, to discover what is so special about Urara Gakuen students and what she could do to "produce" the best students.