Kidou Senshi Gundam - The Origin

From Viz:
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?

Note: Won the Seiun Award for Best Comic in 2012.
The later published Volume 24 included a prequel to the first chapter of the main series and 3 short stories:
-Casval 0057: Tells a story from Char´s youth that explains how his sister Sayla was born.
-Artesia 0083: Three years after the One Year War ended Sayla Mass continues to be pursued by Kai Shiden.
-Amuro 0082: Covers the post-war life of famous Gundam pilot Amuro Ray.