Sora News 24 tours a convenience store in Chikusei, Ibaraki Prefecture, Japan that offers rental showers.
Here in the United States, it's possible to get showers at truck stops, which is handy for long-haul tractor trailer drivers. But I've never heard of getting a shower in a convenience store. It's apparently rare in Japan, too.
Sora News 24 found their showering experience quite inexpensive. A mere ¥200, which is about $1.40 USD, purchases 10 minutes of hot water. That fee also provides free soap, shampoo, and towels so that it's not necessary to arrive with those supplies.
It might be interesting (in all possible meanings of that word) if American convenience stores provided showers.