Holding the door open for others. Pulling the chair out for your date. Saying “please” and “thank you.” Common actions that you (hopefully) do for others. A code of conduct that the Medieval knights originally created.
I am talking about chivalry. I am talking about chivalry because I am talking about Rakudai Kishi no Cavalry. (Yes, “cavalry” and not “chivalry.”)
I try to be as courteous as possible to others, and I do not usually get bothered when others are not. Except for one example: holding doors. More specifically, when I am behind someone and he or she walks through a door in front of me, and he or she does not look back to try and keep the door open, I get slightly irked. No doubt trivial, but I cannot help it.
In Cavalry, holding doors open for others is not a motif. Still, the anime keeps its own doors open for others to witness just how strong it happens to be.