Compared to US common practice, note that there are six coin types, vs. four in the US, with a maximum value ratio of 500:1, vs. 25:1.
At first I kept them all in my wallet coin purse, but juggling six unfamiliar coins meant I mostly didn't use them, and they accumulated. My current system is different:
* 500 and 100 yen in the wallet, because they're real money.
* 1 and 5 yen in a pocket, where I can easily whip them out to zero out the 1s digit of a price.
* 10 and 50 yen in another pocket, where with lower priority I can use them to zero out the 10s digit. But if I feel I've taken too long I can skip this step, since 10 yen coins are still spendable without too much pain.
One thing that's easier is that you only have to provide change to a multiple of 10, while US change optimization often goes for a multiple of 25, and you find yourself figuring 43-25.
Back in the US, I might start using the coin purse for quarters, and a pocket for smaller change.
In other news, I visited a 100 yen store. It was not the specialist in 100 yen cheap shit that I expected, and looked more like a full service supermarket.
I still suck at keeping track of compass orientation. Fortunately today was bright and sunny, so my shadow could tell me I was 90 degrees off a proper course for home. Going for a walk on a bright day without my phone or a watch was somewhat foolish, but I had some idea of what time it was.
See the DW comments at https://mindstalk.dreamwidth.org/530562.html#comments