The first episode, Aoi Hitomi no Casval, tells the story of Casval Rem Deikun and Artesia Som Deikun (Char and Sayla, before Char became known as the Red Comet) before the One-Year War in UC.0068. 
 
The story for the second episode, Kanashimi no Artesia, moves three years ahead to U.C. 0071. The story will follow the tearful separation of the siblings Casval and Artesia (before they became known as Char and Sayla). It will also feature more of the development of the mobile suits, particularly on the Zeon side. 
 
The third episode, Akatsuki no Houki, follows the youth who would become known as Char Aznable and his future comrade Garma Zabi after they join the Zeons' military academy.
 
(Source: Anime News Network)

Zeon ace pilot, Commander Char Aznable, thought he could foil the Federation's plan to build a mobile suit by attacking their research base on colony Side 7. He was wrong. With a prototype already active, the besieged Federation forces strike back using their new weapon, the mobile suit Gundam, with devastating consequences. Amidst the fighting, young electronics wizard Amuro Ray is determined not to let his friends and family die in the crossfire. But what can one boy do to repel a squad of mobile suit-clad invaders?
 
(Source: Viz Media)

What would you do if you suddenly found yourself in the middle of a war? Teenager Amuro Ray sees his life shattered when war comes to his home. During the chaos, Amuro finds himself inside the mobile suit Gundam, the Earth Federation's new secret weapon, and he somehow gets it to work. Amuro and the other refugees flee their homeland on the warship White Base. This group of children and inexperienced soldiers will change the outcome of the war. 
(Source: Sunrise)

What was the tragedy that decided the fates of Char Aznable, the man later nicknamed the "Red Comet" as an ace pilot of the Zeon forces, and his sister Sayla Mass? 

The two siblings' journeys, brought on by the sudden death of their father Zeon Zum Deikun who was a leader of the Spacenoids, are depicted in the four episodes of "Chronicle of Char and Sayla." 

The Zabi family who seize control of Side 3 and lead the Principality of Zeon, the early days of many renowned Zeon ace pilots who later fight in the One Year War, the secrets of mobile suit development, conflicts with the Earth Federation Forces, and the road leading to the outbreak of war—all will be revealed. 

(Source: Official Website)

It is the year Universal Century 0079. Over 90 million humans populate the Earth, and many have been forced to live in space. People now live in large cylinder-like colony clusters called Sides, all ruled over by the "Earth Federation Space Force" (E.F.S.F.). Around this time, a group of colonies called Side 3, located near the dark side of the moon, proclaimed themselves independent from the Earth Federation and made themselves known as the "Principality of Zeon". 
 
Now the war has gone on for eight months and doesn't seem to be ending any time soon. Both factions are at a stalemate. As a last resort, the Federation attempts to produce a new, stronger force to fight against the Zeonic armies. They create the White Base and a powerful Mobile Suit called the "Gundam". However, these suits are piloted by youths...

The story takes place in unnamed timeline, where humanity has highly advanced technology. However, the human population is decreasing and it seems that they're on their way to extinction. 
The protagonists are Leos Alloy, Sthesia Awar and their Haro. They work on a Jupiter base called "Jupiter X", using "General Answer" (or "GA") which contains a massive repository of data about the alternate history of Humanity, Leos travels to the Earths' of the alternate timelines in an effort to collect data that might give them a hint for the evolution of mankind. 
(Source: Gundam Wikia)

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