Japanese Ro-Ro cargo ship Niraikanai II remains aground off Toshima Island after striking rocks during a voyage from Osaka to Tokyo.

The 11,687 GT vessel, operated by Ryukyu Kaiun Kaisha, grounded at around 3:30 a.m. local time on 19 June near the western side of Toshima Island in the Izu archipelago.

There were 17 crew members on board, and no injuries were reported. Authorities said there was no immediate evidence of flooding or oil leakage, while the Shimoda Coast Guard Office confirmed that no fuel spill had been detected.

After the crew sent an emergency message, the Japan Coast Guard deployed a patrol vessel to the site and opened an investigation into the cause of the grounding.

Initial refloating efforts were unsuccessful. Ryukyu Kaiun Kaisha is preparing diver inspections and salvage work, but the timing of any refloating attempt has not been confirmed.

The incident has disrupted services. The company cancelled Tokyo-Osaka and Tokyo-Naha sailings on 19 June, Osaka-Naha service on 20 June, and Wakanatsu trial services via Hitachinaka on 26 June and 29 June.

The Japan Coast Guard’s 3rd Regional Headquarters issued a navigation warning on 19 June, identifying the vessel’s position near Toshima Island and advising nearby ships to navigate with caution.

Weather at the time was reported as relatively calm, with waves of about 0.5 m and southeast winds of around 6 m/s.

Built in 2017, Niraikanai II is 181 m long and operates domestic routes linking Okinawa, Osaka, and Tokyo. The ship mainly carries vehicles, trailers, and other rolling cargo.

Investigators are expected to review navigation data, bridge operations, and voyage records. Salvage teams will assess the vessel’s condition before another refloating attempt is made.