I found a few videos at YouTube for this song in Japanese.

My favorite is one of John Denver singing the song with Minami Kosetsu and Kato Tokiko in Shiga in 1984 (after Country Roads):

This nice video (2 parts) was made by Kyoto Univ. Rowing Club’s OB in Dec. 2006. It is a mixture of still photos and movies. Many of the photos were taken by me. You can see my name in the credits in the end:

This is Baisho Chieko singing the song. Looks like during the 1970s. (Probably illegal uploading.)
http://www.youtube.com/watch?v=ALIuou3mE48

This is a video I took at Okaya, Nagano where the Oguchi Taro song monument is. There’s a sound box which plays the song when you press a button: