Not much is known about Noin before she joined the Lake Victoria Military Academy. She graduated second in her class, allowing Zechs Marquis to take the top spot. After graduation, she stayed on to become a pilot instructor.
However, one night, disaster strikes. Bombs had been set in the pilot dormitories and then in the middle of the night, were set off, killing all the pilots. Furious, Noin went after the one who had set the bombs. After a tough battle that she was unable to win, Noin returned to the Academy and joined Zechs
Noin is eventually forced to join Lady Une at a command center while Zechs is told to fight Heero in the Tallgeese. During the battle, Une stops the fighting by announcing that she will destroy a colony unless the Gundam pilots surrender. Dr. J, the creator of the Wing Gundam, says that he will give up, but he won’t let OZ have Wing. Heero detonates the Wing Gundam and Zechs doesn’t attack while Heero’s crippled body is taken away from the battlefield.
Not long after that, Noin leaves OZ, becoming the captain of the former Sanc Kingdom Imperial Guard and takes Relena to a big gala event where Treize tells of his plans to elimate the Gundams and Relena takes the stage in order to defy him. Noin takes Relena off the stage and apologizes for her behavior.
She then searches for Heero and Trowa and after finding them, invites them to Antarctica with her so that Heero could finish his battle with Zechs. However, they were being tracked by Romefeller, the foundation behind OZ, and they attack Noin, demanding that she tell them where Zechs is. Trowa goes out and saves her, killing all the attackers without a second thought.
After arriving in Antarctica, Heero decides to use Trowa’s Heavyarms Gundam instead of the rebuilt Wing Gundam that Zechs had for him. During the battle, Relena shows up with a letter for Heero and after finding out that he is still injured, tells him that he should kill Zechs. Noin stops Relena, telling her that she shouldn’t want the death of her own brother. The fight only ends when troops show up. Noin saves Relena as Heero and Trowa escape, leaving Zechs to fight the troops alone.
When Relena rebuilds the Sanc Kingdom, Noin goes along, protecting her. She finds out however, that she has more duties than just keeping the Sanc Kingdom safe, like searching for hidden Gundams. Noin helps Sally Po, a former OZ officer escape after being arrested in exchange for the Wing Gundam. The two become friends. Noin somehow meets up with Quatre and Heero and asks them to come with her to the Sanc Kingdom.
OZ invades and Heero takes the Wing Gundam out while Noin and Quatre use two white Taurus suits to fight.
Sometime later, Romefeller attacks the Sanc Kingdom and Noin, Quatre and the Maguanacs, a group of mobile suit pilots that follow Quatre, go out to defend the kingdom. But instead of watching her friends die in defense of her country, Relena dissolves the Sanc Kingdom and allows her to be captured. Quatre and Noin escape to space before they are captured or killed by enemy mobile suits.
Relena is eventually crowned Queen of the World by Romefeller in order to promote false ideas of peace. Noin, Quatre and Trowa are then attacked by OZ Soldiers and are saved by Duo. During this, Zechs had been approached by Quinze of White Fang who had asked him to be their leader. He accepts.
Libra, White Fang’s ship, attacks Barge, OZ’s last space outpost and Noin takes Quatre, Trowa, and Duo with her in order to find out what Zechs is really going to do. Treize removes Relena from her position as Queen of the World, stating that siblings shouldn’t be pitted against each other in all out war. Sally Po finds Heero and gives him Trowa’s old Heavyarms suit and they head out into space. Zechs takes Epyon out to fight the Gundam Pilots. When Barge tries to fire, Zechs destroys it.
Sally, Wufei, and Heero eventually meet up with the others onboard Libra. OZ soldiers, desperate for a victory, hold the colony with the circus that Trowa works at hostage, demanding Libra in exchange for the colony. Trowa takes Wing ZERO out in order to protect Catherine, a girl who works in the circus along with him, but Quatre manages to talk him out of it. Trowa then regains the memory that he lost after almost being killed. Zechs then fires Libra at Earth.
While Libra readies to fire on Earth again, Sally orders Peacemillion to ram the beam cannon, making it useless. After encountering Zechs, Noin can’t bring herself to kill him. The same thing applies to Zechs; he can’t bring himself to kill her either. She eventually goes with him to the top of Libra, where they wait for Heero in order to finish a fight that never got finished.
While the other pilots continue to battle, Noin watches Heero and Zechs fight. Zechs had planned on destroying more of the Earth by crashing Libra into it. Lady Une announces the Earth’s surrender as Treize dies.
During the battle between Heero and Zechs, the other Gundam pilots try and destroy as much as Libra as they can in order to prevent it from falling on Earth. One final piece remains however, and it’s the piece that has Zechs and Heero fighting inside of it. Zechs manages to escape through a wall of flames and Heero gets out and destroys the final piece of Libra, saving the Earth.
Eventually she joins an organization, lead by Lady Une, called the Preventers. Their goal is to prevent terrorist attacks that will threaten the peace that had finally been achieved.