The Muroto is a limited express service on the Mugi Line, which runs between Tokushima and Awa-Kainan, once a day.

The Awa Steamship Company, which operated a service between Honshu and Shikoku, first built an 11 km line from a port at Komatsushima to Tokushima which opened in 1913.

[citation needed] The line was extended a further 35 km to Mugi in three stages opening between 1937 and 1942.

The first 12 km section to Kaifu opened in 1973, and further construction undertaken until work was suspended in 1980.

In 1988 construction work south of Kaifu was recommenced by a private company underwritten by the Tokushima Prefectural Government, and the next section opened in 1992 as the Asa Kaigan Railway Asato Line.