In 1997, the line was sold to Yokohama Minatomirai Railway Company (MMR), a joint venture of Tokyu Corporation, the Kanagawa prefectural government and the Yokohama city government.

MMR today owns the right-of-way, Kodomonokuni and Onda stations and the rolling stock, but the actual operation continues to be contracted to Tōkyū.

Local residents along the train line have expressed an interest in getting the Kodomonokuni Line extended northward to meet the Odakyū Odawara Line at Tsurukawa; however the planning has not yet taken off because the proposed rail alignment, despite its short distance, involves two prefectures (Kanagawa, Tokyo) and three cities (Aoba-ku, Yokohama; Asao-ku, Kawasaki and Machida, Tokyo).

The travel time from Nagatsuta to Kodomonokuni is 7 minutes (with one stop at Onda).

All trains are based at Nagasuta Depot, accessed via a spur located before Onda Station.