R.C. 1014: A mysterious mobile suit, G-Self, is being pursued by a group of space pirates and the Capital Guard. The suit is captured by the pirates and the pilot of the suit, Raraiya Monday, is captured by the Capital Guard. A week later, a class of Capital Guard Academy cadets are riding a Crown transport module up along the orbital elevator, Capital Tower, to reach space where they can conduct their first live mobile suit training. On the way up their Crown is attacked by space pirates and their mobile suits, one of which is the G-Self. Bellri Zenam, the youngest of the cadets, pilots a maintenance mobile suit to hold off the G-Self and helps capture the pirate suit as well as its pilot, Aida Surgan.

Capital Territory is attacked by a squadron of space pirate mobile suits led by Cahill Saint, who wants to rescue the captured Aida. Bellri and his friend Noredo manage to rescue Aida as the structure she was being held in was damaged during the attack. Tasked with piloting the G-Self to repel the pirate attack, Bellri kills Cahill in an act of self-defense as Aida watches.

Piloting the Montero, space pirate ace pilot Klim Nick tries to once again assault Capital Territory in an attempt to rescue Aida from its clutches. As the battle breaks out, Bellri, Aida, Noredo, and Raraiya happened to be in G-Self's cockpit while testing their abilities to pilot the mobile suit. Aida succeeds in wrestling control of the G-Self from the others, who remain in the cockpit as she escapes from captivity with Klim.

Klim and Aida return to the space pirates' mothership, the Megafauna, with the G-Self, along with Bellri, Noredo, and Raraiya, who are held hostage. Meanwhile, the Capital Army, the Capital Territory's new military, is officially unveiled to the public and its first mission is rescuing the hostages from the Megafauna. Bellri, wanting to protect Noredo and Raraiya, pilots the G-Self to put a stop to the fighting, but ends up being forced to defend himself from the Capital Army mobile suits and he successfully repels their attacks.

The Capital Army unveils a new mobile suit, the Elf Bullock, piloted by the mysterious Mask, who leads a team to once again attack the Megafauna. After having gained the trust of the Megafauna crew, Bellri also promises to Aida that he will protect the ship in order to make up for his killing of Cahill, and once again helps fight off the attacking Capital Army mobile suits. However, Bellri and Noredo reveal that they are secretly spying on the pirates and have a plan to escape with the G-Self.

The Megafauna launches into space in order to create a distraction for the passing Amerian Space Fleet. Dellensen Samatar, Bellri's old instructor at the Capital Guards, pits an Elf Bull to leads a squad of mobile suits to once again attack the Megafauna to try to rescue Bellri. Unbeknownst to Dellensen, the G-Self was actually piloted by Bellri, and the two engaged in combat. The two eventually discovered each others' identities, but it was too late as Bellri shoots Dellensen's Elf Bull down, killing his old instructor in the process.

The Megafauna launches a decoy while waiting for resupplies. Meanwhile Bellri's mother notices the Capitol Guard have taken over command of the space colony, she plans to escape to Earth to join her son. On Earth Klim Nick decides to take out the Montero and G-self piloted by Raraiya to test her abilities. During this flight the Mask Corps launches their next attack. Bellry, who now has to pilot a standard Mobile Suit in combat, manages to save a helpless Raraiya and retake control of the G-Self. The battle ends in a draw when the Mask Corps retreat when Space Pirate reinforcements arrive.

Mask's forces pull away from attacking Megafuna's mobile suite due to the sudden attacks by the appearance of a Amerian mobile armor. Ameria army of Mick Jack's test machine, Armorzagan, holds off Mask's Forces as Amelia Army inspector general Gusion that appears with supply force traveling to the Megafuna. Bellri to be surprised to know that it is the father of Aida. The Inspector General's supply task force refit's G-Self's damaged flight pack with an experimental flight pack called the "Tricky Backpack", which gives Bell's G-Self new capacities to interfere with a mobile suit electronics. Aida's takes her G-Arcane is regulated to the escort her father by riding with his's transport aircraft. However, she suddenly abandons her father when they detect an emerging of unidentified machine intercept from Capital Tower direction. Mask struggled against the G-Self's Tricky Pack equipment, find himself having to abandon the battle. Meanwhile, Aida pilot's her G-Acrane to limits of her machine's flight capacity higher altitudes try to intercept unknown boogie. Unknown to Aida the unidentified machine she is tring to intercept is Bell's mother. After conclusion of the battle with Mask, Bellri rushed G-Self to aid Aida, but soon discovers inbound orbital glider is his mother. Bell manages to restraint Aida and catches the glider and brings it safely back to the Megafauna. Capital Tower Operation Director Wilmit Zenam (Bellri's mother) meets face-to-face with Gusion on Megafauna, is given her explanation of his nation's motives as possing as pirates and reviving forbidden technologies. Zenam find it hard to believe, however Aida presents photos of illegal actives accruing around the Moon. Wilmit becomes distract and tells Bellri and the other former kidnap victims that their returning to the capital. Elsewhere, Manyi who was aboard the Garanden is a recruit of Capital Army and serves as volunteer on the warship. She encounters Captain Mask after arriving from his defeat. Thou he does not admit it, but Manyi becomes aware of Captain Mask's true identity.

The Megafauna makes an under the radar approach to Capitol City to start a dialog between the two parties. A short fight between the mobile suit with Mask and Bellri in G-Selff ends in another loss for Mask. After hiding the Megafauna in the Jungle a small unarmed sortie group departs for Capital City.

The Megafauna prepares to launch into space and is attacked by new Capitol Guard mobile suits called Wuxia. The Wuxia's mission : to retrieve Bellri, Raraiya and G-Self from the Space Pirates. Arcane, supported by deflected Capitol Guard Catsith mobile suits, tries to defend the Megafauna. Miss Aida, piloting Arcane, gets into serious trouble when a Wuxia completely overpowers her and the Arcane. She is rescued by G-Self deploying a new prototype ground offensive pack. Director Wilmit Zenam (Bellri's mother) is heading into space together with his Holiness. Also onboard is Mask who has a mysterious meeting with the science program director. Meanwhile the Capital Space fleet launches to engage into battle in outer space.

With both the Capital Army and the Amerian Army greatly boosting their space forces as well as the perceived threat from the moon, a space war is brewing. A squad of mobile suits from the Capital spaceship Garanden, led by Mask, sorties to attack the Megafauna in space, but was fended off by Bellri and the G-Self.

The Amerian army fleet engage the Capital Army in battle. After withdrawal of the Capital Army forces, the Amerians quietly take over control over the top of the Capital Tower. However, unknown forces from the Lunar orbit attack and destroy one of the Amerian Army ships.

A delegation from the lunar forces is heading to the Capital Tower to state their demands. Faced with a common enemy the Space Pirates, the Capitol Guard and Captain Mask join into an uneasy allience. Raraiya seems to calm down when she recognizes a house inside the Capital Tower. The allied forces decide to head to the far side of the moon to investigate the origin of the Lunar colony and the danger it represents.

At the top of the Capital Tower his Holynes leads the negotiations to establish a treaty between the Earthnoids and Towasanga. Raraiya has regained her full memory and wishes to return to the lunar City. Captain Mask and his mobile suit team perform a decoy attack so the Megafauna can set course to the colony on the far side of the moon. Bellri captures a, surrendered, mobile suit pilot from the Lunar Forces. The Megafauna is closely followed by the Capitol Guard space fleet.

Megafauna and the Salamandra join forces to stop the fierce attacks by Dorette Fleet. Raraiya explains that the Lunar colony always had the intention to return to Earth. However the " Reconguista" plan did not work out as expected because of differences between the Rayhunton and Dorette families. Also she explains rhe G-Self is YG-111, a Rayhunton developed, but rejected Towasanga army mobile suit. In space Bellri in G-Self equipped with additional back-pack fire power manages to hold his ground and chase of of the attacking mobile suits. Both Megafauna and Salamandra dock at an older space colony in moon orbit. Both ships send out boarding parties to scout the colony, however they end up receiving a different welcome.

After learning that Bellri and Aida are brother and sister and from the Royal Rayhunton family, Bellri takes of in G-self a.k.a. YG-111 to blow of some steam. YG-111 is an advanced mobile suit that can be piloted and used to full capacities by Rayhunton family DNA bearers. Meanwhile the Mask Corps also arrives at the space colony and since Mask decided not to engage and defeat the Dorette Fleet, the power balance and alliances seem to be shifting again.

During Debris cleanup a mysterious malfunction in Rayara's mobile suit almost sets of a unwanted conflict between Amerian, Capital Guard and Towasanga Mobile Forces. Meanwhile Captain Mask is still plotting to retrieve the G-Self which his Amerian "allies" are not going to allow. The Towasanga family feud gets more complex as traitors also seem to be present on the Megafauna. All parties agree to work together to clear the debris, with leaked from the Cyrano 5 space station, to make sure the Capitol Tower can receive the energy the Earth needs to function and maintain a civilization.

An almost perfect performed attack directly in the Megafauna hangar by Captain Mask fails and Bellri maintains his control over the G-Self. In space the Megafauna needs to change position if they want to stay out of a multiple party firing range, the only available option is to head for the departing Crescent Ship. This mysterious ship is build from the same Hermes blueprints as the G-Self. So getting G-Self, Bellri and Aida close to the Crescent Ship seems a good plan. An experimental mobile suit electromagnetic attack by Towasanga pilot Rockpie proves again the superior defensive and offensive capabilities of the G-Self, as Bellri deflects the attack and is able to enter the Crescent ship. Meanwhile Aida and Rayara barely prevent Megafauna crashing into the Crescent ship. Bellri uses his amulet to unlock an energy operation cycle of the Crescent ship. Joined inside by Aida and with the Megafauna docked outside, the Crescent ship is presuming its course to the mysterious Venus Globe.

While in transit to the Venus Globe the Megafauna crew gets some R&R time. Their final destination s an advanced "Hermes Foundation" solar battery in construction, build to ensure the energy independence of mankind. A welcome party turn out to be Highly advanced mobile suit mercenaries, called the Solaria Ten. They capture the Crescent ship and Megafauna. With Bellri disabled by a sudden act of treason, the crews are now hostages aboard their own space ships.

With Bellri retaking control of G-self, using the Arcane, the fight against the G-IT Corps can truly begin. However beam fights inside the Venus Globe construction are of course extremely dangerous. And while G-self is trying to take out the G-IT leader due to reckless fire the outer hull of a massive space station is damaged, resulting in an unstoppable flow of water turned to ice into space. G-Self follows the waterflow and ends up in a earth like environment. An environment with a sea rapidly draining itself into space........Meanwhile Megafauna tries to outrun the battle and reach the Solaria Ten colony to contact its leader.

With the sea draining out of the Rosario Ten space station, the G-IT Corps captain is slowly coming to his sense about the damage he caused. However G-self is still under relentless G-IT corps attack. Megafauna and the Crescent Ship head to the Rosario Ten space dock. Arcane and the other mobile suits find their way inside the colony to help Bellri. A heroic decision by the G-IT corps captain is succesfull and he is able to "plug" the hole in the sea, however his own live is on forfeit. Meanwhile the crew manages to get their hands on a new mobile suit prototype the G-Lucifer. After reuniting with Megafauna the director of the space station invites Bellri, miss Aida and the crew for dinner. At dinner he explains that the he is over 200 years old.....

With all forces heading towards the earth sphere a confrontation between the Earth Forces and the Dorrette fleet seems only a matter of time. A short meeting with Bellri's mother at the Capital Tower does not please Bellri, nor miss Aida, at all. G-Self is now equipped with the perfect backpack, Venus Globe technology, and it might be even more firepower than Bellri is used to. Manny now in control of her own Venus Globe mobile suit finally reunites with captain Mask.

With G-Self and crew joining Megafauna they choose to fight this war in their own way. Bellri tries to show the Venus Globe observers not to choose sides and help to stop the upcoming war. The fight between the parties is in full motion with Captain Mask trying to obtain control of the full Moon Ship and use its power to strike a final blow at both the Dorette and Amerian fleet. Bellri suffers a personal tragedy when the Mobile Suit piloted by Rockpie destroys a Venus Globe observer and Bellri reacts by releasing G-Selfs full power, and thus destroying his oponent and killing Rockpie. Also are miss Aida and Bellri siblings or not ?

While the Dorrette and Amarian fleet are about to form an uneasy alliance against the Capital Army, captain Mask makes a destructive move. Barbara Peor, fueled by het jealousy of Manny, uses an advanced cloaked Pyramid shaped space ship with a destructive energy weapon called Yggdrasil. Without any effort she takes out all space ships in her vicinity, either Dorette or Amarian. G-Self manages to temporarily stop her relentless attacks. But not before miss Aida's fathers space ship get destroyed.

The G-IT Corp and Captain Mask's forces come under fire by the surviving forces of both the Amerians and Dorette Fleet. Everyone races to try to intercept the G-IT Corp's Full Moon ship. Captain Mask using his newly acquired Venus Globe Mobile Suit leads his forces in defense of his ships. They manage to destroy the last warship of the Dorette fleet and it's mobile suit forces. Bellri trying to recon the situation comes under attack by Captain Mask and Manny in G-Rach but they are forced to withdraw when re-entering Earth's Atmosphere.