I took an overnight ferry from Osaka to Kagoshima in Kyushu, Japan. It was more like a cruise ship than a ferry and relaxing to spend 15 hours. If you are looking for travel ideas for your future Japan travel, this might be a good option.
The overnight ferry that I took: Ferry Sunflower
The ship’s name: Satsuma
The route: Osaka to Shibushi (Kagoshima)
The room: Superior Single Room
I booked through its official website. If you google “Ferry Sunflower English”, it will come up. Booking is available in English.
Traveling Japan by First Class Overnight Ferry | Hokkaido to Tokyo
Trying a Special Capsule Cabin on the Ferry in Japan | Hokkaido to Niigata
Trying a Unique First Class Cabin on the Overnight Ferry to Hokkaido Japan
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