This isn't really related to the comic itself, but when I translated this yesterday, I randomly looked up the word "驕るな" (the thing plastered on Sensei's forehead above) and found out this random line spoken by one of the Nameless Priests near the end of Volume F became a meme on the JP side of the fandom last year. Dunno why that is. Maybe that particular line is kinda humorous out-of-context, at least in Japanese?

On Danbooru itself there are 3 posts referencing this meme (post #6401514, post #6792731, post #7073352).

Also, a little bit of trivia: the official English translations of the game translated "驕るな" as "Don't be mistaken!"