Ah, well, like many of the things on this trip, this is something we'd do better if we were doing the trip again someday.
Speaking of luggage, we have to do some shuffling today if we want to not be loaded down with luggage. If we knew that the train station in Chioshi had the large-size lockers -- one of my bags won't fit anything smaller -- we could take our stuff out there on the limited express we expect to take this morning. Because we do not know this and don't want to get stuck in a bind, we'll instead take our luggage the short distance up to Tokyo station, store them there, then take the limited express to Chioshi and spend the day exploring that area and its quirky local train, then come back to Tokyo on another limited express, get our bags, and return to Narita and our hotel nearby. Fortunately, we can sleep in tomorrow.