Wait, what? Like outside of the booster category being kobans-only now? Just any random thing in the gear, books, and gifts? If true, foul play, and you guys truly are horrible horrible people for this.Some pieces of equipment within the market are randomly assigned a koban price;
(Now I wonder if I've wasted any kobans on that. I had not noticed anything marked differently. But this is the sort of thing that we would be pointing out to you and complaining about as a bug report when we did notice it. Because that just isn't right.)
Edit: Just a quick thought off the top of my head. Could you instead rework the shop interface to have categories for cash gear (just as it currently is: white, green, yellow), koban gear (yellow, green, purple), cash boosters (white only), koban boosters (green only), cash books (just as it currently is: white, green), koban books (green, yellow), cash gifts (just as it currently is: white, green), and koban gifts (green, yellow)? In short: Distinct and well marked sections for each separate option (and I assumed that the selection would be better in the koban shops).
(Edit / side note: Oh wow, legendary really can show up in the shop. Got one in there right now and hadn't seen one until now. I know in the old system the text acting as a cheat sheet for the rarity names/colors showed epics but I never once saw an epic piece show up. So I had assumed it was the same thing here. Legendary shown as a thing that exists, but not actually possible to obtain in the shop.)
Edit again: Or maybe as a simpler alternative and if random koban items will definitely be a thing that can happen, maybe a koban icon 1/4 the size of the item's image can be overlayed on the corner of all shop items with the koban cost? Quick at-a-glance clarity. And then might as well put a cash icon on the cash items as well.
Also, I think one person mentioned earlier in the thread that the confirmation is gone for spending kobans on the button to collect from all girls at once. If true (I haven't checked it personally, I avoid that damn button) that's a dirty trick too and it needs to be fixed again.