The Niijima Kurihama ferry route connects Izu Islands with Japan. Currently there is just the 1 ferry company operating this ferry service, Tokai Kisen. The crossing operates up to 2 times each week with sailing durations from around 2 hours 10 minutes.
Niijima Kurihama sailing durations and frequency may vary from season to season so we'd advise doing a live check to get the most up to date information.