Guyver: The Bioboosted Armor

Also known as:  Kyoushoku Soukou Guyver (2005), Guyver TV

The TV anime series Guyver was adapted by studio OLM (Oriental Light and Magic), based on a manga authored by Yoshiki Takaya. While investigating a mysterious explosion, Sho Fukamachi discovers the Chronos Corporation's greatest weapon: a techno-organic suit of bio-armor known as the Guyver. With Chronos determined to conceal its secrets, Sho finds himself relentlessly pursued by an army of horrific bio-monsters. When he runs out of options, Sho is forced to call upon the fearsome powers of the Guyver.

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Producers, official website and other details: AniDB, ANN, Wiki