Ninchugen (if that's how you read it, I'm not sure) is certainly a great punk-acid blast.
Inundow put out another album by him, slightly earlier stuff I think, called Kurisuto wa umagoya de umareta (ie Christ was born in a stable). That was acoustic, just guitar and vocals so perhaps a bit closer to the folk tag. And there was also a 2CD comp of live stuff, as well as a 2CD live Rabbits disk.
Inundow has a habit of not keeping things in print though, so I think all that's available at the moment are the Ninchugen thing, and a Rabbits CD called Winter Songs.
The solo stuff was originally released in the early 80s, some of it on flexidiscs. The Rabbits were a bit later. But as far as I know since then Miyazawa has gone totally AWOL.
