We have accepted bookings written in German, Japanese, Chinese and English. But we speak English, and Japanese as a rule.
Sometimes a party of guests will have only one person who speaks Japanese or English. Sometimes the person who speaks Japanese is speaking it as a second language.
On one memorable occasion, there were two guests, and one spoke English. But the English conversation was eased by Junko writing things in Japanese Kanji, and having them interpret it into their native tongue, than to speak English together.
For that reason, it may be a good idea to let us book your cruises and activities.
The cruise options available from Japanese and Chinese websites are far from complete. There are a lot of combinations of options which are not advertised in foreign lands.