Suggest you contact the hotel. I know in Australia that is commonplace, but I am not sure in Japan

Great question. My wife and I stayed in a very traditional ‘Ryokan’ on about the 2nd day into our holiday - and it was a shell shock! They spoke little or no English and it was hard going. Having said that, it was a good experience. However, we stayed at a more relaxed Ryokan later in our trip, the staff spoke limited English and tried to accomodate us. They also put on a (Japanese version of a ) western breakfast which we appreciated. So give it a try - if it is too hard, have a backup plan - and my saviour was Google Translate with the Japanese dictionary

Thank you! Our laundry services cost is 2×100YEN,detergent added automatically

I don't know but I would email them and see whether they would.

I have checked Hotel home page. There is the following statement about "Express Courier Service": If you send your parcel(s) to our hotel Please write the name(s) of the hotel guest(s) (full name) and check-in date and send your parcel(s) to our hotel. We will give you the parcel(s) at the time of your check in. We do not accept CODs. Please pay when you send the parcel(s). Please ask to the Google site with the phrase of "Daiwa Roynet Hotel Express Courier Service". I think you can find the hotel service page including "Express Courier Service".