Oki Kisen sails five routes between six ports in Japan, mostly Saigo, Sakaiminato and Beppu (Nishinoshima). From Saigo: Sakaiminato, Beppu (Nishinoshima), Shichirui, Hishiura and Kurii. From Sakaiminato: Saigo, Beppu (Nishinoshima), Hishiura and Kurii. From Beppu (Nishinoshima): Saigo, Shichirui and Hishiura.