I just couldn't shake the feeling of how this could've been the title drop but I guess that wasn't the plan...
Scouring through akakakakakaksaka's
twitter, Chapter 21 is
named, based on rough
gtranslation, "The Crown of Thorns" (thorny crown sounds kinda meh frankly).
OTOH, it makes sense if you consider the fact that the fictional universe doesn't consider these princesses as fairytales. Still think its a missed opportunity tho (then again, I don't know why I'm still reading this, but both my response and the manga's plot seem to be, as one m+ reader put it, "sure, whatever; let's keep going with it")