Kefka simply walked into the library, no one could see her so it wasn't like she could check out a book the normal way. Thankfully the check out system was automated, so she just used Zephyr's card for the books she wanted to take to her little hidey hole.
She browsed the section on translation, looking for the next book in the Latin to Modern English section. Finding the one she wanted she went to a table near the window, since if she bothered turning on a light someone would just turn it off not knowing she was there. She began reading the book. It might seem useless, Latin being a dead language, but she loved the feel of the old words on her tongue. Some people liked French or Japanese, she liked Latin.
Kefka was totally engrossed in her book, and since no one could ever notice her, she had no reason to be paying attention for others.