[ She can't exactly blame him for that sort of reaction; it might be hard to understand for those who aren't familiar with the realities of being a magical girl. ]

Oh, but those are just temporary, to celebrate the opening of the shop! I could think of something more permanent for your club's members~

[ She decides to address the easier part of his comment first. Now that that's out of the way, she needs to explain her situation, though she figures the best way to do it will be by omitting the more... disturbing implications behind how the world of magical girls operates. ]

Ah, you see, magical girls often end up fighting over territory... Having a Coordinator pick a side or join a group would give them an unfair advantage, so I'm obligated to remain neutral in all sorts of conflicts and provide my services to anyone, as long as they can pay the price.

[ She makes a pause, allowing for that to hopefully sink in. The girl then claps her hands, following it up with something that should give him a better idea of what she's talking about. ]

For example! Let's say a group of delinquents decides to harass one of the members of your club. Surely, as their friends, you would like to come to their aid and protect them, no?