Kurosawa question

[Curtis Tsui]

This webpage

http://www.umich.edu/~iinet/cjs/films/reviews/hiddenfortress.html

features a reference for a Kurosawa work entitled AKUMA NO YO NI 
SAISHIN NI:  TENSHI NO TO NI DAITAN NI, circa 1975 through Toho.

Does anyone have any clue as to what this is?  Another 
autobiographical work?  The Toho credit suggests something film 
related, but this item doesn't pop up on any filmographies that I've 
found.

Any help would be appreciated....

Curtis