It's kind of heavy on the math and not exactly written for pleasure reading, but the front matter suggests that it's suitable for secondary school (which it identifies as "ages 7-10", but it also claims to have been published on Mars).

The girl finishes her much shorter book, orders an omelette and sandwich and food for all six of her Pokémon, asks for a handbook on working Security, reads it, signs on for a job, goes to sit in the Security office, comes back after a four-hour half-shift during which a few people who seem to be regulars and just want to eat come in and go out and don't make any trouble, gets a couple other things to read and reads them, and then departs the bar.