This class consists of the only KOSEI MARU. She was completed in Feb ’24 for Sakai Shoten K.K and named MEIJI MARU. Purchased by Shimatani Shosen K.K. in Aug ’33, she was renamed KOSEI MARU the following month. Requisitioned by the IJN in Dec ’38, she was converted to an auxiliary transport in Oct ’41.. She was torpedoed by a US submarine in Jan ’44.