Chronos track down Malmot. Malmot is forced to self destruct after being caught by Chronos soldiers and in the explosion the three G-Units scatter.
A G-unit is accidentally activated by a student named Sho Fukamachi triggered the control medallion and is transformed into the Guyver I.
Sho faces deadly battle against the bio morphic zoanoids controlled by the Chronos organization, Gregole and Vamore.
Riscar is sent to examine the recovered Guyver unit. But when he examines it the control medal is activated and he becomes Guyver II.
Chronos dispatch Riscar to confront Sho and the two Guyvers do battle.
Sho is no match for Riscar because Riscar knows how to use the Guyver and Sho doesn't.
But things get brighter for Sho when the Guyver II's damaged control medal starts to malfunction.
Guyver II decays and while it dose Sho uses the megasmasher and finishes Guyver II.
Commander Guyot is not impressed by Genzo Makashima's progress and goes to Chronos Japan HQ to manage the company.
Makashima is worried about losing his position and tries to regain his position by using Mizuki to get to Guyver I.
Chronos kidnap Mizuki and Makashima's their trump card 'a Hyper Zoanoid named Zerbebuth) for their plans to defeat Guyver I.
Guyver one arrives at the warehouse were they took Mizuki and kill all of the Zoanoids he sees.
But Guyver I faces a new threat, a new type of Zoanoid appears (Zerbebuth).
The only way Sho can defeat Zerbebuth is by using the megasmasher, but he can't because Sho dose not know were Mizuki is and for all he knows he could hit her.
Sho finally delivers a damaging blow to Zerbebuth upsetting the beast greatly.
Zerbebuth goes to use Mizuki as a shield but before he got to Mizuki Guyver III showed up and killed him.
Sho and Tetsuro try to expose Chronos by telling a reporter, Takasaro, about Chronos.
But Chronos destroy Takasaro's office with a deadly explosion.
Chronos decide to attack Sho and his friends before they try to expose them again.
The Hyper Zoanoid Team Five are sent to destroy the school.
The Hyper Zoanoids plans go well and Guyver I is no match for them, until Guyver III shows up and kills Thancrus with his megasmasher.
Guyver I then destroys Gaster after the death of Thancrus.
Commander Guyot gives orders for the rest of team five to retreat due to the appearance of Guyver III.
And above all Mizuki finds out that Sho is the Guyver.
For failing to defeat the Guyver, Gendo Makashima is turned into a new model of hyper zoanoid called Enzyme.
Enzyme and Guyver I battle.
Guyver I was no match for Enzyme. Enzyme pulled Guyver I's control medal from Guyver's head and gave it to the Hyper Zoanoid Team 5.
Even after Enzyme took the control medal from Guyver, Guyver came alive and kept fighting, but both were killed when Guyot made Enzyme self destruct.
Agito reveals his true identity to Tetsuro and Mizuki when he transforms into Guyver III and helps them brake out of Chronos Japan Headquarters.
At the same time Guyver I and Sho are reborn again through the control medal and get even with Chronos.
Guyver III Destroys the Zoanoids in the proccessing tanks, while Guyver I kills Derzerb and Elegen of team five along with many other zoanoids he finds.
Guyver III meets Zektoll and battles.
Zektoll is more powerful and is superior until Guyver I shows up.
Zektoll escapes and merges with what's left of Elegen.
Guyver I, III, Tetsuro and Mizuki find Guyot and learn mankind's true genesis.
Mizuki and Tetsuro escape Chronos HQ while Guyvers I and III Finnish Guyot, but before they fight, Zektoll appears.
Zektoll was winning until both Guyvers combined their force and used both their megasmashers destroying Chronos Japan Headquarters along with Zektoll.
Sho's father is believed to be dead and if that's not enough he has more problems.
While rescuing Tetsuro, Sho meets a new allie, a freelance rider named Murikami.
Murikami takes Sho and Tetsuro to Relics Point (Mount Minakami) were Sho's father and Mizuki are.
Chronos sends out three of the lost units to kill the Guyver.
They all have unique ability's and the Guyver is no match for them all.
Even though it is three to one the Guyver manages to kill two of them and the last one, a zoanoid called 'Aptom' is called back.
Murakami takes Sho back to a safe house.
When Tetsuro is asleep Sho leaves and meets Guyver III on the way and both of them set off to rescue Mizuki and Sho's father.
Mr Fukamachi's cell is opened by a Chronos combatant but whe the combatant removes his helmet he relizes it is Sho.