I know that this is a beginning of 80's concert of Zaiko. I have seen black and white footages of various songs from this. Have just noticed this better quality clip has been uploaded. Do you know if this concert is available in full length and what the title of the show is?

The man who uploaded those back and white footage on youtube around 2008-09, sadly passed away a few years ago.

There's no full-length version available at the moment, except for those who have the original VHS at home.  he concert is very rare today because it was only released that year, unlike other Zaiko shows broadcasted live on the national television, for example those of 1975, 1983 and 1985 that got reiussed on cassette and DVD. This one of 1981 and 1973 never got reissued.