Revolutionary heroes ranging from John Brown to Kim Il-Sung are isekai’d to a fantasy world that parodies shows like ‘the rising of the shield hero’ to break the chains of slavery in all forms once more and liberate the fantasy workers and the peasants from the yoke of feudal oppression while hunting down so-called “heroes” summoned by the feudal lords who intend to use them as tools to preserve their power and the economic base of their feudalistic slave economy.
Show me Stalin riding a chocobo or some shit leading a calvary charge against slaver caravans!
Show me Marx, Engels, and Lenin working together in the cities inspiring the proto-proletariate to take up arms against the feudal robber-barons and their land-leechs that bleed them dry
Show me Mao, Tito, and bonus character Jan Žižka, on a rural bro-venture with the three in a competitive rivalry to see who can organize the greatest peasant rebellion between the three!
When they say animation studio, they typically means a Japanese studio does the design and key frames, then they send it to usually some SE Asian country to do the in-between frames. This is why you will often see Vietnamese names in the credits of nominally Japanese produced shows. I would imagine it’s something similar here.