Hmm... I think this might be the first time i've encountered a setting where Elves specifically adhere to the logic that the bow is a man's weapon. The sling is an interesting compromise...
Going by future raws, though, Yoshida is still all for the gunpowder fire crystal revolution, since she upgrades to a better, more gun-like lock action weapon later.
@IrregularPerson Chapters 6 & 7; the organized crime ring that Yoshida tried to deliver mail to because she accidentally got her senpai's bag. The Legal Army "audited" them.
Edit: Also, two of those folks at the end we first met in chapter 5.