We are flying ANA. Our guides are the same as you mentioned in an earlier post, James and I think Toyomi or something like that, I can’t find my note at the moment.
Last minute stuff - travel size first aid stuff, just in case. I had to get an international size carryon which I did a few months ago, and decided I wanted separate locks rather than moving the ones from my US carryon. A friend who was in Japan last year suggested travel packs of toilet seat covers as she found not all restrooms had them. Dramamine for the flight over - to help me sleep. Smaller sizes of bottles of aspirin & etc so I have original packaging rather than larger containers. Moleskin in case I end up with any foot issues. And small bottles of hand sanitizer. I like to be ready for various possible issues - LOL.
I have a plastic crate where I have been tossing stuff I am starting to put aside for the trip and as I come across gaps, I either add to my Target shopping list or order from
Amazon.