Can I use the toilet, and do I need to buy something? You're walking around in Japan, you need a restroom, and a convenience store is right there. Two questions usually show up at the same time: is it actually okay to use their restroom, and if you do, do you need to buy something on the way out? The short version is worth saying up front, because the honest answer isn't a strict rule either way. The short answer Whether a store's restroom is open to customers at all is a store-by-store decision, not a nationwide law. None of ...