Evergreen will provide two 900-TEU vessels on the NSE/NS6 service, while Wan Hai Lines will deploy another 900-TEU ship.
The service gets underway in late September, when the first departure from Hong Kong will be made by the Evergreen vessel, Uni-Ample.
The port rotation for the 21-day rotation service will be: Hong Kong (HIT), Tokyo, Yokohama, Osaka, Kaohsiung, Hong Kong, Ho Chi Minh, Laem Chabang, and Hong Kong.
The NSE/NS6 service has been introduced to cater to increasing customer demand for cargo space, especially northbound from Thailand to Japan, a joint statement said.