- Accidental Innuendo: The scene where Nomura helps girls dress mawashi in the fourth episode is full of this, including "I'm angry that he finished too soon with me" and "spread your legs and hold it tightly."
- Cliché Storm: Intentionally used by the author to depict manners of a one-gender school. At the same time, he loves playing with tropes and averting or subverting it as well.
- Esoteric Happy Ending: The anime ends with Nomura beating Amou, who gets expelled from school for causing trouble, but still manages to make peace with her. All's well and good... except for the fact that Amou still declares Nomura to be hers and hers alone, not to mention she never really shows any remorse for her sociopathic behavior. Furthermore, it's implied she didn't actually learn anything from her experiences in Aichi Academy and will continue causing trouble elsewhere, and yet we're expected to believe her love for Nomura has redeemed her somewhat. Not to mention, getting out of the effective captivity the school had forced her into was her entire reason for going on such a rampage in the first place.
- Genius Bonus: The manga has many fans among Japanese martial arts practitioners for it's rather realistic portrayal and many references to real Japanese fighting techniques and combat styles. The same case also applies to the prequel, Shinakoi. Probably even more so for Shinakoi, thanks to it being even more detailed when it comes to the martial arts aspect.
- Growing the Beard: The anime starts hitting its stride when unveiling Nomura and Rin's backstories and Amou makes her move against Nomura and the Five Swords. Also, the animation is not nearly as half-assed as in the beginning.
- Harsher in Hindsight: The girls forcing the boys to dress and act like girls to protect themselves sounds eerily like the real-life Straw Feminists trying to feminize boys at an early age to snuff out all forms of masculinity.
- Memetic Mutation: Calling Satori Morgan Freeman. It is however.
- Only the Author Can Save Them Now: In the Final Battle, Amou is portrayed as downright invincible, utterly destroying (to the point that it's almost portrayed as mortal injury} the Five Swords, each one of their Quirky Miniboss Squads, completely shrugging off hits from bladed weapons, countering everything that's thrown at her, and by the end of it taking a Magic Bullet and not going down. While it's stated that he could fight her as an equal in the past, considering that she just destroyed a large number of incredibly skilled fighters it stretches the Willing Suspension of Disbelief that he could even put a scratch on her during her rampage, let alone beat her. So of course, she purposefully loses.
- Squick: Episode 6 depicts Nomura touching a female bear's breasts. That's right, he molested an animal. It is paid pretty heavily for laughs since said bear was already quite fond of him.
- What an Idiot!: Rin and Mary falling for the photo Satori took of her naked on top of him after she drugged him. As fellow members of the Five Swords Council, they should have had enough contact with her to at least consider the option that she might have done something like that, especially since Warabi (stated to not be the brightest beforehand) took one look at it and instantly figured out what was going on.
YMMV / Armed Girl's Machiavellism