The last of humanity fighting a mysterious enemy. Sidonia's story is paced better/faster than Titan and introduces new plot points regularly to keep you interested. Sidonia is like Titan in space with mechs and a stronger plot and characters. I feel like Sidonia accomplishes what Titan is trying to do much better.
It is a time where the human race is being exterminated and hunted by dreadful abominations. The final bastions of humanity stand up to make their last desperate fight for their survival. The difference between Shingeki and Sidonia is that the former is set in a medieval fantasy world in a fight against Giants, while the latter is a fight against aliens called Gauna (with amazing regenerative abilities) in outer space.
The fight for survival begins! Shingeki no Kyojin (Attack on Titan) and Sidonia no Kishi (Knights of Sidonia) both deals with a setting in which humanity is being threatened by an entity capable of wiping them from existence forever.
The mysterious enemies involved in both series are aggressive and attacks humanity with no warning on various occasions. As such, resistance is formed as humanity takes a stand against this mysterious enemy. It's a fight to survive.
- Both have a monster enemy (Titans in Shingeki no Kyojin and Guana in Sidonia)
- Both have certain weaponry used to combat these enemies (3MDG in Shingeki no Kyojin and mechs in Sidonia)
- Both have humanity pretty much driven into a corner as an effect of the monsters being hard to kill. In Shingeki no Kyojin humans are behind the Walls and in Sidonia there is a ship which wanders through space.
- Both of them have protagonists who initially act outside of orders but get better about listening as the story progresses.
- Differences are that Shingeki no Kyojin is just on the Earth in a sort of pseudo-medievalish/1800s type setting while Sidonia is sci-fi in space. read more
Both manga have a post-apocalyptic setting where the human race is on the brink of extinction and is under attack by an unknown destructive species that are shrouded in mystery. Sidonia no kishi is a lot more straight forward than Attack on Titan and just passes by as a sci-fi action manga with fast paced battles. In contrast, Attack on Titan tries to be a little more psychological, mysterious and has more focus on world building but still retains the hectic action similar to Sidonia. Although both don't focus on characterization, the cast of Attack on Titan is a little more fleshed out than the one in Sidonia but characters are not the strong point of both of these manga's. If you liked one of them for the hopeless post-apocalyptic setting and action, there is a high chance you will like the other also for the setting and action  read more
The story takes place in a city where it's said that has thousands of levels.
In a shutdown area, thousands of levels overlap each other, you couldn't tell the sky from the ground and you couldn't tell which way is up or which way is down. Maybe the original purpose of this story is to unravel the mysteries bound in this time and world. For the humans who found this vast rare multi-level city, the mysterious main character "Kirii" wanders to search for the "Net Terminal Genes" that were not infected.
Created by the same author, Sidonia no Kishi and Blame! are great examples of sci-fi series that explores the depth of their worlds. Both series adapts a more mature environment where the main characters must adapt in order to survive. There are elements of suspense that takes place in future apocalyptic-like world. Nihei's deliverance of both series is spellbound with character interactions and dynamics of what it tries to convey as a genius piece of sci-fi adventure.
Despite the contrasting settings, both series delivers a premise that hits the sci-fi horror chords. The main characters confronts monsters in their worlds as they fight for survival. Throughout both series, they uncover the horrible truth regarding some secrets that were met to be locked away. There is decent amount of action along with great story building present in both series. Recommended for fans of sci-fi.
Different time settings but the atmosphere feels the same with the grim reality involving monostrity that threatens humanity's very existence.
Claymore and Sidonia no Kishi conveys the very essence of survival. However, there is resistance involving characters who takes a stand and fights for what they believe in. There are mysteries relating to the monostrity present in both series. Furthermore, the main characters themselves are topics of mystery relating to their background origins. There is the reality of horror that becomes pivotal to deliver its message to viewers into both series.
In both the main character is a guy who suddenly becomes a mecha driver, passing from monotonous life to a fast-paced one!
Both have fights with big mechas against a misterious enemy, lovely art and good plot
Similar character designs, a near immortal protagonist, futuristic setting and themes of what it is to be human, and what it is to be a weapon. Both really great manga full of intense action, a well-conceived science fiction world, great art and interesting questions. If you like one, the other will definitely be worth checking into.