Rooms and Modes

Librarian mainly revolves around one two-floor library plus a post-completion Special Stage. The useful distinction is not enemy rooms; it is whether you are doing the main 3,072-book cleanup or the post-clear ultimate-skill objective.

Room / Mode	Use it for	Route advice
Main Library	The main two-floor cleanup space containing all 31 shelf sections, the 3,072 books, the four keys, and the chests.	Treat it as two maps: first floor for 1A-1N and second floor for 2A-2Q.
Special Stage	Post-completion mode tied to Overtime Avoider and the ultimate skill.	Enter after the main clear and use the ultimate skill; do not route it like another manual main-library cleanup.