When it comes to Romance of the Three Kingdoms Liu Bei (&, in turn, Shu) is often treated as the de facto "hero" of the story, due to him rising up from poverty & suffering many defeats early on, only to continue fighting & eventually become the ruler of one of the titular Three Kingdoms; there's also an element of the "divine right of kings" due to his royal heritage. Therefore, it only makes sense that the very first TV anime adaptation of Romance, though technically detailing all three sides to some extent, would focus primarily on Liu Bei's side of the story.
Come the end of 1970 mangaka Mitsuteru Yokoyama was arguably already a legend of the industry, having previously made iconic & trendsetting manga like Tetsujin 28 (1956-1966), Sally the Witch (1966-1967), Iga no Kagemaru (1961-1966), Kamen no Ninja Akakage (1966-1967), & Giant Robo (1967-1972). Yokoyama would continue that trend in 1971 with the debut of Babel II, while also bringing to an end an eight-volume manga adaptation of Suikoden/Water Margin, one of the Classic Chinese Novels, as Yokoyama was also a fan of making manga based on history. Suikoden was serialized in the magazine Kibou no Tomo (previously Kibou Life), which throughout its history has been known to publish manga based on history & folklore, including Osamu Tezuka's iconic Buddha & part of Yukinobu Hoshino's Professor Munakata Series. Kibou no Tomo's publisher Ushio Shuppan is also affiliated with the infamous Soka Gakkai, but its various manga have no direct connection to that organization; Soka Gakkai has another publisher specifically for stuff relating to its own executives. Anyway, after finishing up his adaptation of Suikoden, Yokoyama would begin a new historical manga for Kibou no Tomo, though this next one would be much more grand in scale: A manga adaptation of Sangokushi/Romance of the Three Kingdoms.
It is worth noting that, by this point, most of the Japanese populace had become familiar with Sangokushi by way of a re-telling done by novelist Eiji Yoshikawa that was originally serialized in newspapers from 1939 to 1943, i.e. during World War II. Comprised of only 10 volumes in total, Yoshikawa's Sangokushi was a bit of an altered adaptation in some ways, namely when it came to further romanticizing the "main" characters, and notably stopped at Zhuge Liang's death during the Battle of Wuzhang Plains in 234, 46 years before the actual end of the era in 280, when Jin conquered Wu & unified China. I bring this up because, though technically based on Yoshikawa's version of the story, Yokoyama's manga didn't stop at Wuzhang Plains, but instead actually went all the way to the very end of Luo Guangzhong's 14th century novel. Because of this, Yokoyama's Sangokushi would run from 1974 to 1987, during which Kibou no Tomo would get renamed to both Shonen World (in 1978) & later Comic Tom (in 1980), and eventually totaled 60 volumes, making it Yokoyama's longest single work in his entire catalog, with some considering it his magnum opus; as of May 2020 it has sold over 80 million copies, roughly tying titles like Tokyo Revengers & Fullmetal Alchemist. Much like how Yoshikawa's version helped popularize the story of the Three Kingdoms in Japan for many generations, Yokoyama's manga is seemingly considered just as influential when it comes to how the country interprets that era of Chinese history.
In the mid-80s NTV & Shin-Ei Animation would produce a pair of Sangokushi anime TV specials that ostensibly claimed to be based on Yokoyama's manga, so much so that Hikari Production co-owns the copyright to them with Shin-Ei, but in reality aren't; I covered those (in comparison to Shinano Kikaku's theatrical film trilogy) back in February. However, an actual anime adaptation would debut on TV Tokyo on October 18, 1991, though the companies behind it were nothing that one would normally expect for anime. Namely, the animation studio behind it was AZ (pronounced A-Z[et]), which had previously only worked on the majority of the Raven Tengu Kabuto TV anime for NTV in 1990, and following this anime would never be seen again. Also, the main producer for this TV anime was... Dai Nippon Printing, a general printing company that had literally never done anything like this, both before & after, at least when it comes to being the company that fronts the main share of the money for an anime & thereby co-owns the copyright, with Hikari Production. Now, to be fair, DNP co-produced this anime with Yu Entertainment, a short-lived company founded by Kenji Yoshida, one of the "Yoshida Brothers" who co-founded Tatsunoko & had previously been that studio's second president, following Tatsuo Yoshida's passing. Still, DNP's direct involvement shows just how big of a deal this anime, simply titled Yokoyama Mitsuteru Sangokushi/Mitsuteru Yokoyama's Romance of the Three Kingdoms, was at the time by being the first TV anime adaptation of Romance, and it would run for 47 episodes before ending on September 25, 1992, stopping with the conclusion of the Battle of Chibi, which was roughly the halfway point of the manga. Since it's so long I'll be splitting this review up into two parts, so let's see how the first 22 episodes of Yokoyama Sangokushi (as I'll be calling it from here on out, for simplicity's sake) fare.