This is the first volume, issues 1-6, of the Monthly Esoteric Buddhism Lecture Series published by Hirakawa Publishing. As you can see from the table of contents, this is a rare book featuring prominent figures in the Japanese esoteric Buddhism world, including Yasuo Kiriyama, the head priest of Agon Shu. As these books were published between 1974 and 1976, there are some stains and dirt. Please purchase with your understanding of this point. We will offer this to those who understand its value.