@Simpleton
no, i get it. you're not wrong at all that it could definitely be racism. my point is more that they have all races at the magic school, she's not the only demon there. By and large, everyone who goes there is pretty tolerant of other races, since otherwise you're in for a rough stay. I think you're probably right that it's race related because that's the running theme of a demon in humanland. but at least it's not the millis region.
re:missing v stolen
like i mentioned before, in the source material there's a fair bit devoted to how intense the security and rules are for the library (even if it kinda gets skipped over in the spinoff). using magic, candles, or water (like roxy was considering) would get you in a monumental pile of shit, even if you're just using magic to create light. A lot of these books have magic circles that can activate in the presence of magic, too. Books don't get taken out 'accidentally' (because magic, i dunno man), so if it goes missing, it's assumed stolen or destroyed.
tl;dr
you're probably right, and all the crazy library rules in the novel aren't mentioned here