Description from animenfo.com

Virus Buster Serge takes place in 2097, in a little place called Neo Hong Kong, which I thought was rather cool -- finally a bit of a departure from constant Neo Tokyo references. The denizens of earth are currently being threatened by an entity that calls himself the Incubator, who has created an evil virus which can infect both man and machine. Infect machines? Sound rather weird? At first I thought so as well. The virus does infect mecha, called Armored Gears in this series, taking them over. Enter STAND, a group of elite individuals encased in really cool powered armor suits called Variable Gear. The Knight Sabers ... err, wait ... STAND ... uses these suits to great effect fighting rampant virus infected Armored Gears. Serge himself enters the scenario against his will, as all reluctant heroes must. He has been plagued by really bad dreams, which have convinced him that STAND`s leader, Raven, should be dead. He decides to make this happen by assassinating Raven himself, but only succeeds in earning Raven`s attention. Raven decides Serge is quite a potential fighter and manages to snare him through cunning and trickery into joining STAND to help fight against the Incubator`s viral attacks.