The good: The characters are diverse, well written. The background, and the world setting are very realistic and internally consistent. The threat is real, menacing, and completely mysterious. The art is also well drawn. Characters are easy to tell apart. Also, Chevalier acts as expected for a nebulous organization with unlimited power, funds, and little to no oversight.
The bad: Not only does the author seem to have some kind of rape fetish, but each arc is just one idiot plot after another.
Start: Stella's backstory. Sexual harassment in spades by her half brother. Outright rape is only barely avoided.
What's the best way the powers that be see to train their soldiers? Have them fight with live weapons in a "carnival" to the point of unconsciousness or death to see who's the strongest. Apparently, from that point on, the strongest gets to brutalize everyone else in her class, and the senior students can brutalize their juniors. In universe, this is called "military discipline." Can anyone explain what military in a civilized society allows their officers to brutalize their subordinates? In fact, a third year, Miyabi, decides to "claim" the new transfer student, Kazuya, whether he consents or not, and when he refuses, she, in essence, tries to rape him. She also decides to have Stella raped for coming to his defense. When Stella
ACTUALLY DEFENDS HERSELF, the entire class of third years, minus Chiffon, decides it's a good idea to beat her into submission. (Furthermore, the teachers do nothing to stop any of this.)
El Bridget resort: Violet: Really? Trapping Lois and Satellizer on an island with no way to leave sounded good to you? Poor Holly.
Alaska Arc: So the best way to answer a soldier's questions regarding the efficacy of a drug upon which the lives of all personnel in the base may well depend is electric torture? Oh, and the best way to treat subjects of a drug trial is to kill them when the drug doesn't work as intended, and let them know it?
Busters Arc: The best way to eliminate Gengo Aoi "quietly" and with plausible deniability is to let four of the most mentally unstable people possible go on a rampage using equipment effectively stamped with your name, who see nothing wrong with BRAGGING ABOUT IT? After promising them a "get out of jail free card?"
Why does no one ever bother to train Kazuya Aoi?