This is a book by Akira Tago, a best-selling author of the "Head Exercise Series," and can be considered an enlightenment book about life. A considerable amount of time has passed since its publication, and the book itself has some stains and dirt. Please refrain from purchasing if you are sensitive to such things. The cover, which is shown in the 6th image, will also be included, but it has stains, scratches, and minor tears. Please be aware of this beforehand.