[Joshua follows suit, taking the time to neatly stack the books he'd been perusing before placing them into his bag. He's gotten into a cycle of taking a couple of books home with him and then bringing them back within a couple of days.]

[As they ready themselves to leave, Joshua thinks Kazuya's question over.]

I'm not very familiar with your repertoire.

As long as it is something that will not attract too much attention, then whatever you feel is best will suffice.