SD Gundam World: Sangoku Souketsuden  

SD Gundam World: Sangoku Soketsuden, SDガンダムワールド 三国創傑伝

After meeting Liu Bei Unicorn Gundam and Guan Yu Nu Gundam, as well as Zhang Fei God Gundam, Liu Bei decides to save the world from destruction caused by repeated warfare. However, just when hope for revival seems possible, an epidemic of the mysterious Yellow Zombie Virus breaks out, causing chaos and forcing people to live in fortified cities relying on a finite form of energy known as "Trinity." The virus carriers lose their minds and attack others, leading to social stratification and conflict among the survivors. Each city is isolated by walls, and each country is ruled by a lord, including Dong Zhuo, who has been behaving outrageously since the previous ruler's death. Despite these challenges, Liu Bei and his newfound allies Guan Yu Nu Gundam and Zhang Fei God Gundam decide to save the world and bring about great change in history.