Nations once full of pride and glory are now in ruins after suffering great wars repeated over and over again, and it is an age in which the great land is covered in mountains of wreckage. Finally, just as the signs of restoration begin to be seen, a mysterious virus called the “Yellow Zombie Virus” has been spreading across the land for the past several years, and the infected, who lose their self of self, start attacking Mobile Suits one after the next.

In order to protect themselves from the infected coming to attack them, the remaining Mobile Suits are forced to live inside city strongholds. However, behind the fortifications, after the death of the former lord, the lord Dong Zhuo is as domineering as can be.

[Source: Crunchyroll]

The balance of the worlds is maintained by heroes. Suddenly a red-hot meteor falls upon one of these worlds, called Neo World. An amnesiac youth named Wukong Impulse Gundam appears at the point where it landed. The chaos that starts with this incident spreads through the other worlds, one after another.

At the same time, Zhuge Liang Freedom Gundam learns via astrology of an impending disaster. He and his sworn friend Liu Bei Unicorn Gundam take action to save the worlds from this crisis, and begin a journey along with Wukong.

What will Wukong Impulse Gundam think as he meets the heroes of each world? Will this youth bring about peace or catastrophe? Now begins a new story of heroes!

[Source: official website]

New story is set in "Musha World," and features the reappearance of heroes like Wukong Impulse Gundam and Nobunaga Gundam Epyon.

Through the efforts of the heroes, the world escaped the threat of collapse due to the Dark Mask and peace was restored.
All the heroes then returned to their respective homes.

A few years later...
Throughout Knight World, disturbing rumors have begun to spread, saying that a group calling itself the "Z Clan" is building its strength and scheming to overthrow King Arthur's reign.
Arthur Gundam Mk-III, the ruler of Knight World, orders his young nephew Knight Strike Gundam to investigate.
To seek the facts behind the rumors, Knight Strike Gundam leaves Castle Camelot and sets out on a journey.

[Source: official website]