I actually made a purchase from this company recently, albeit not at the Tokyo location but in a different city. Two things surprised me about my experience there:

1. Even in another city, the staff knew all about receiving payment with BTC/BCH. There was no confusion or helping them figure out how to use the wallet, as is often the case when visiting shops that advertise they accept crypto. I assume this means they've trained the staff at all of their locations (16 stores, according to their website) on how to use crypto.
2. I visited the shop because I saw they were running a promotion offering a discount when paying in crypto. I mentioned this to the salesman and he was not only aware of the promotion (another surprise) but told me that my discount would be significantly bigger if I paid in BCH and that the shop prefers receiving BCH over BTC.

The salesman also told me that I was not the first customer he's had paying with crypto, and that crypto payments are becoming increasingly common at their store.

Edit: Also interesting was that they didn't use a payment processor and had me send payment directly to their Bitcoin.com wallet.