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It's sorta fun reading these early drafts for series which end up becoming iconic, seeing some of the budding ideas while they're still not fully fleshed out. A few notable examples of these core ideas: Humanity lived in enclosures to protect against the titans (But each city had its own enclosure, and the enclosures are made up of trees). There is a soldier, named Murakumo in this manga, who is also a titan and fights against other titans while in titan form (But he's aware of his own titanhood all along, and gains his titanhood relatively recently by having a "heart filled with righteousness" which made it so he took over a titan's consciousness when it ate him). The titans have a weak point which must be targeted, called a "nucleus" (But the location of the nucleus differs from titan to titan, and it's just a membranous orb). The titans can transform into human form and infiltrate the cities (But they don't have a base human form and instead are able to shapeshift into the form of any human, or at least any human they've eaten). The art is noticably worse than Attack on Titan (which already isn't the greatest at drawing human faces). At this point, the titans aren't even drawn all that well, but there are some cool action shots. The best-drawn scene is when Murakumo cuts down that one guy. Of course the fights come about because the titans are ravaging the town. The story is built around Tsubaki, who wants to be Murakumo's disciple and train to fight titans in order to get vengeance, and the contrast of such self-serving motives with Murakumo's noble, defense-oriented reasons for fighting.
Not bad. Thi is like a proposal for the entire Attack on Titan series. The drawings are a litte rough buuuuut the story is good, a little basic, but it has all the elements of the series, maybe it was like a small side story, and considering how dark is the main series, this one is even a little hopeful.