Just so you know, I sort of answered this a few posts ago:how? It's auto now,
Juro brings it up when Shiba talks to him which is the first thing he does
once you learn about the break area, it automatically defaults to mentioning it to Shiba every time you start the checkpoint in the classroom.
I actually managed to circumvent this by rushing to get my bag and step out of the classroom first thing as soon as the checkpoint loads. If you do this, you get the option to go back to the cafeteria.