I took the Kokai II bound for Otsushima.
The staff were very kind and the boat trip was pleasant.
One thing, as others have mentioned,
The "Otsushima-bound parking lot (with a waiting area nearby)" and the "actual boat dock" are completely different. (When I took my trip, it was on the other side of the building where you buy tickets.)
When the time approached and the boat still wasn't docked, I asked again at the ticket counter and found out it was a different dock.
I was glad I made it just in time, but I wish they'd put up a sign indicating the boat dock near the ticket machine. (There is a sign, but it wasn't on the path from inside the building to the ticket machine, so I didn't notice it.)
I used this ferry when heading to the Kaiten training base ruins on Umajima Island in Otsushima.
It's less than a 10-minute walk from Tokuyama Station.
Tickets are sold inside the Tokuyama Port Building. There are two types of ferries operating: one to Otsushima and one to Oita. The operating companies and tickets are separate for each.
Facilities such as toilets and waiting areas are available.
A 3-minute walk from Tokuyama Station via a straight road.
Two companies operate ferries: "Otsushima Cruise" to Otsushima Island (where the Kaiten Memorial Museum is located) and "Suonada Ferry" to Oita Prefecture in Kyushu.
There are three departure/arrival points: Suonada is directly in front of the pier extending into the sea, while Otsushima Cruise departs from the two points on the right and left.
Otsushima Cruise offers two types of ferries: the regular cruise ship "Kokai II" (44 minutes to Umajima) and the high-speed ferry "Shin-Otsushima Ferry" (18 minutes). Note that the departure/arrival points are different.
While the signs at Tokuyama Station and the port, as well as the company's website (dated August 21, 2018), indicated the high-speed ferry was on the right and the cruise ship on the left, the actual departure/arrival points were reversed.
First-time users of Otsushima Cruise should confirm the departure/arrival point verbally with the ticket office staff.
2019/1/22. Tue
There's a free parking lot next to the boat dock, which I used. (^ω^)
A one-way ticket to Umajima, bound for the Kaiten Memorial Museum, costs ¥710 for adults.
You can purchase a round-trip ticket at the ticket counter. (^^)
Once you've purchased your ticket, you can board the boat right away.
There are unreserved seats.♫
There are also accessible seats. (◠‿◠)
On nice days, the seats on the second floor are comfortable.☆
A crew member will come and collect your ticket while you're on board.♫
Thank you for the wonderful boat trip.♡♡
A ferry terminal with an unusual location, within walking distance of the Shinkansen station.
Ferries depart from here to Oita and Otsushima Island.