Hmm. . . 16K JPY for a weekend sea can be interesting, especially if you were with accommodation for the night, i. e. leaving early on Saturday, coming back expired on Sunday.
Hopefully, many are this service reinstalled. Then, perhaps the other beetle ferries will also work, which are even less expensive and a few minutes faster.
remember the days when you could take the ferry from Sakaiminato to Vladivostok Pusan, the price of the return ticket cost about 18,000 JPY. . .
I did the FUK Beetle and the Osaka evening service. I liked the latter: the Beetle is like being on a plane; The ferry is on the sea. Also, you might meet someone who is also renewing their visa, join me a few beers, and then spend some wild time in Pusan.
For other people who are a little dizzy, jet ferry service is the option.