There are several books about the Kojo-ryu, and I would like to examine what is written about it. From the old books, we have Karate-do Kyohan, written by Tominakoshi (Funakoshi) Gichin, published on May 25, 1935 (Karate-do Kyohan Reprint, May 26, 1985, published by. Kazusa Co.) The text is in Volume 1, Chapter 3. History of Karate, page 9, last two lines.
The contents are as follows.