Fish B.
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For travellers visiting Nachi Waterfalls, take the bus in front of the main entrance. It runs about twice per hour. It’s 630 Yen one way per person.
If you are looking for food to take on the train, there is an Onigiri Shop 50m from the main entrance and a small Bento shop on the west side of the station.
There is also a Lawson about 10min from the station towards the harbor.
Lots of restaurants nearby too, try their Tuna sets. They are probably all delicious.