Kyoushoku Soukou Guyver (2005)

Lurking under the facade of everyday life lies a dark world of pain and destruction.​ The world is controlled by a sinister brotherhood that hides their fangs behind masks of humanity.​ They are the Chronos Corporation.​ While investigating a mysterious explosion near his school,​ Sho Fukamachi happens upon the Chronos Corporation's greatest weapon: a techno organic suit of bio armor known as "the Guyver.​" But Chronos is determined to conceal their secrets at any cost.​ Sho soon finds himself relentlessly pursued by its army of horrific bio-monsters.​ With nowhere to run,​ Sho is forced to call upon the fearsome power of the Guyver and rip his opponents limb from limb in a desperate struggle for survival.​ (Source: Funimation)