http://user.chollian.net/~fbirds/renai/album.html

The above link does have a lot of info on the band and recordings etc. Its not your site, is it?

It does list a songbook published by Warner Bros, but the list of songs, does not include the title of the one you refer to. Do you have the composer credits? That might help.

I did see them perform once, in the early days, when Keith Relf, (yes he who sang with the Yardbirds), was the singer. They used to have a problem gigging then as many venues just could not provide a quality piano. It was rather essential for their music and I remember a show being cancelled for that reason. The band had turned up but could not perform as the piano was crap.

Sorry I can not be of much help