Just when the world was close to reviving itself after a devastating war, a deadly epidemic known as the "Yellow Zombie Virus" begins to emerge. Said virus drives Mobile Civilians mad and turns them into mindless berserkers, forcing survivors to hide themselves in fortified cities, dividing the world into three countries; Shu Area, Wei Area, and Wu Area. Three warriors Liu Bei Unicorn Gundam, Guan Yu Nu Gundam and Zhang Fei God Gundam meet each other and decide to work together to save the world.
The net anime started airing in July 26, 2019, directed by Takahiro Ikezoe (Sword Gai: The Animation, Show by Rock!!), with a new episode scheduled to release on "the 4th Friday of every month". There's also two comic series, both released in April and available on the official website. One is titled "SD Gundam World Sangoku Soketsuden: Soshoki" (Drawn by Luk Mo Shek and launched on April 10. Also serialized in Explorer Publishing's monthly Hong Kong magazine Lucky, and releases new chapters on "every 10th of the month" both on the website and as a Motion Comic.), while the other is "SD Gundam World Sangoku Soketsuden: Enkotan" (Drawn by Naoto Tsushima, and launched on April 19. Releases new chapters "monthly every 3rd Friday".). Soshoki focuses on Cao Cao Wing Gundam, while Enkotan focuses on Sun Jian Gundam Astray, and Takuya Yamanaka is in charge of the story for both comics.
Tropes associated with SD Gundam World Sangoku Soketsuden are:
- A Day in the Limelight: Episode 3 of the anime focuses on Cao Cao Wing Gundam with Liu Bei only appearing at the end.
- Alas, Poor Villain: Yuan Shao Red Warrior in Soshoki. After trying to assassinate Cao Cao, he was grossly mutated by the Yellow Zombie Virus and caused the first outbreak in the Wei Area. After being forced to Mercy Kill him, Cao Cao commented it must've been hard for him and swearing he will find the person responsible.
- Alternate History: This tale is based off of a classic Medival-Chinese War-Story, yet the setting seems more akin to modern-day cities.
- Alternate Universe: Romance of the Three Kingdoms already got adaptated for the SD Gundam franchise with Sangokuden. However, both Sangokuden and Sangoku Soketsuden are completely separate from each other. This can be easily told by the characters, who portrayed by different mechs than in Sangokuden (For example, Liu Bei is played by the original Gundam in Sangokuden, whereas in Sangoku Soketsuden, he's played by the Unicorn Gundam).
- Conspicuous CG: Inverted. The anime mostly consists of cel-shaded CGI characters, but hand-drawn extras appear occasionally who use a different shading style that make them stand out from the rest.
- Curb-Stomp Battle: Happens in the second chapter of Soshoki. Cao Cao Wing Gundam and his group were given one by Lu Bu Sinanju and Zhang Liao Sazabi under orders from Yuan Shao. This battle ends with Cao Cao's first defeat and the loss of Xiahou Dun's eye.
- Darker and Edgier: While Sangokuden was dark for an SD Gundam work, Soketsuden blows it out of the water, and not just because of the Zombie Apocalypse setting.
- Imagine Spot: During episode 2 of the anime, Zhang Fei tries to guess what Zhuge Liang is like, showing various scenes of him as a Mad Scientist.
- In Medias Res: The Soshoki manga is told this way. It opens up with Cao Cao Wing's attack on Yuan Shao Red Warrior before flashing back to Cao Cao's past for the next four chapters.
- Mood Whiplash: A staple of Enkotan. It's common to have it be lighthearted and comedic one page, then someone gets attacked or assassinated on the next.
- Mythology Gag:
- From the little of Cao Cao's father that's seen in Soshoki, his design appears to be based on the Wing Gundam, the predecessor to the Wing Zero that Cao Cao's design is based on.
- Our heroes get the token Secret Test of Character when they have to retrieve something from a gashapon machine for Zhuge Liang Freedom Gundam, and end up with a string of junk draws when they get three Doms - which Zhuge Liang immediately accepts. The Freedom Gundam is from Gundam Seed continuity, which also boasts its own Black Tri-Stars team complete with three Doms, and they're all allied with Freedom pilot Kira Yamato on the side of Lacus Clyne.
- Zhao Yun 00 Gundam is Dual Wielding swords instead of the long spear he's usually carrying, which is not just the reuse of the 00 Gundam's actual weapons, but a nod to the China-made series God of War Zhao Zilong, which adds a pair of MacGuffin swords to the Three Kingdoms mythology.
- Da Qiao Gundam Artemie and Xiao Qiao GN Archer share a kit that includes parts to build one or the other. This is likely a reference to how the GN Archer is the rebuilt Gundam Artemie.
- In episode 4 of the anime, there is a flashback to when Zhuge Liang was given his feather fan-shaped Device by his teacher, Zhang Jue. The weapons on the table alongside the Device are Sonken Zephryanthes's Gaouken Zeroichi, Sou Sou Gundam's Enkoujin, and Koumei Re-GZ's Bakuousen.
- In Episode 7 of the anime, Lu Bu Sinanju has Gundam-like eyes peering behind his monoeye, in reference to how the Sinanju was developed from the Sinanju Stein, which the Unicorn Gundam is also based on, stolen from the Earth Federation, which was in turn based on both the ν (Nu) Gundam and Sazabi. It's also a reference to Professor Gerbera, who is an SD Gundam based on Anaheim's scrapped Gundam Gerbera designed for the Federation with an armor based on its rebranding for Zeon as Gerbera Tetra.
- Offer Void In Nebraska: Strangely, the series is extremely limited in its home country of Japan despite the popularity of SD Gundam there. The anime episodes and Soshoki cannot be viewed in Japan and there is no Japanese version of Enkotan. The models kits are also only available from Gundam Base Tokyo. Japanese fans have gotten around this by watching the Traditional Chinese version of Soshoki on Youku, but are still disappointed in the lack of availability in their country.
- Recycled In Space: BB Senshi Sangokuden is already Romance of the Three Kingdoms with SD Gundams and other MS, but Sangoku Soketsuden adds Zombie Apocalypse on top of that and takes place in a futuristic setting.
- Robot Hair: By lieu of everyone being based off of Giant Mecha, a number of characters possesses this. Some characters like Guan Yu Nu Gundam and Huang Zhong Gundam Dynames even have Robot Beards.
- The Virus: The "Yellow Zombie Virus"note , which causes the victims to lose themselves and start attacking people.
- We Hardly Knew Ye: In the Enkotan manga, Liu Bei Unicorn's mother. She's introduced in the first chapter only to sacrifice herself at the end to save her son from a Yellow Zombie Virus horde aerial ambush. Then in the next chapter, she solidifies her fate by cutting the ropes on the bridge to allow Sun Jian and her son to escape.
- Wham Episode: Chapter 12 of Soshoki. Sima Yi reveals that the Bugs were an alternative solution for the Trinity crisis, as they would not use up the rare resource and proposes turning the populace into Bugs to slow the consumption, as humans are driven by their appetite. Cao Cao is against this until he finds out that Xun Yu was killed during a civilian riot while the company was delivering supplies to them. Remembering what Sima Yi said, Cao Cao decides to go with his plan.