It started so good, I was really into the story and characters until the entire manga became two subplots: shipping and combat.

The artstyle is really unique, the scenery and the characters were so great drawn, the character design is a little confusing at the beginning, but after some chapters you get used to it. The jokes were really ok and the characters were interesting, until I got to the last arcs of the series...

Beware I made a whole rant and it contains spoilers.






The story started pretty good, presenting the cast with our main character being Nagate in his fight against the mysterious beings called Gauna. I really liked the interaction between the characters in the first arcs, it was fluent, you got to know them well, and there was also a very scientific background to everything that it was being added to Sidonia, the experiments they conducted on Gauna.

The part where the plot started to decrease was when the first chimera was introduced. Tsumugi was not a bad character since she was there to show that in some way a Gauna with human mind could be helpful to Sidonia.
Why didn't the story focus on that?, explaining what were the Gauna to begin with, what was their purpose, how did the Ochiai's mind work, why the Gauna were attracted to the Higgs particles! nothing was explained in the end! it was a whole mess!
The subplot of romance between Nagate and Tsumugi was so disgusting and horrible, she was a newborn child! and she was the child of Hoshijiro's mutated Gauna's placenta!! come on! it was extremely forced, if the Gauna ended up not being bad but beings trying to learn from humans or something, maybe the shipping could have worked; but it was not like that.

Nagate is such a horrible MC, I mean he felt in love with Hoshijiro and was sooo into her as to fell in love with the placenta that resembled her. When she was abducted I though he would react like a normal human being... but nope, he forgot about her and focused on Tsumugi. He was the best pilot of Sidonia and it was obvious, he never failed. Every reckless decision he made was considered ok and always ended up in victory. He was too perfect!

Ochiai was the bad guy just because! I mean I would have prefered to ended up with humans contacting the Gauna and learning more from them, understanding or even decided to leave the energy resource to stop them from coming. But no...

Suddenly the story became a harem where every single girl was fighting over Nagate's attention, even the AI robot. After episode 45 or something the series stopped being interesting, it became a chore to finish it. The pages were all explanations of how the weapons of Sidonia were made of, whole chapters focused on destroying a single Gauna (with too many shots from the information HQ received) and the ending was the worst of all. Nagate ended up with Tsumugi, who suddenly didn't die (not even by being totally incinerated by a star's energy) and ended up turning human. Izana (who became a women for Nagate) ended up with a Yuhata who decided to turn into a boy for some reason, I mean she was always showed to have interest in man.

Ughh it was horrible! wouldn't recommend the series at all, that ending was the worst. After it started being realistic and scientific, it ended up being like fantasy story where everything works, killing the villian saved everyone and even the imposible ship was made canon.