Guyver: The Bioboosted Armor + MOVIE : OUT OF CONTROL + OVA I&II

Synopsis:
The Chronos Corporation has secret plans for the world and have biologically engineered employees and soldiers who are able to transform themselves into powerful monsters at will, beings called Zoanoids. A test type Zoanoid, disguised as a normal man, escapes after stealing a bag containing three items Chronos was studying, known as the Guyver units. Chronos soldiers attempt to recover the units from the test-type but he activates a grenade, killing himself and scattering the Guyver units. One of the lost units is discovered by two high school students, Shō Fukamachi and Tetsurō Segawa. Shō accidentally activates the unit and it merges him with the biological armor, increasing all his physical abilities and arming him with deadly weaponry. He is now a Guyver, later specifically designated "Guyver I."
Determined to recruit Shō or recover the Guyver armor from his body (even if removing it proves fatal,) the Chronos Corporation begins sending Zoanoids after the teenager and his friend Tetsurō. Also at risk is Tetsurō's sister Mizuki, whom Shō loves. The Zoanoid attacks lead to escalating battles that result in Shō learning to be a deadlier warrior while uncovering more of his armor's abilities. Thanks to their influence in politics and new media, the general public is kept unaware of the secret war between the Chronos Corporation and Guyver I. Eventually, Shō meets other Guyver users and uncovers the secrets behind the origins of their units, the Zoanoids, and the Chronos Corporation.