Ferry from Tokyo to Tokushima

Anybody can tell me a travel agency that sell the ticket for this ferry?
The advice from the website is that you better can buy tickets at such an office because the ferry company speaks only japanese language.

I didn't find an adress where I can buy tickets for our trip with this ferry

https://www.otf.jp/english-page/

Half way down the page. Follow those instructions or don't.

travel agencies which the site mentioned are something like JTB, 近畿日本ツーリスト,日本旅行. they have branches all over Japan (in major cities).
after you come to Japan, go to the the nearest above travel agencies and ask it.

thanks for reactions, I will try the mentioned options. We have still time before we went to Japan this year

For sea sickness medication I highly recommend the Japanese ‘Aneron’ - available (over the counter) at chemists, many convenience stores etc. (USD$5) For some reason they don’t seem to sell onboard ships or in port. We’ve found it a truly miracle seasickness medication compared to anything we’ve taken outside Japan.