Up to the 20th volume were published monthly, but the 21st volume published in 1989 was a collection of letters divided into three sections, and the 22nd volume published in 1992 was divided into two sections, and each was sold for the price of approximately 15,000 yen.
20巻目までは毎月刊行されたが、21巻は書簡集上中下巻で1989年に、最終巻の22巻は上下巻で1992年に、各巻とも1万5千円前後で刊行された。