This is a key book to understand the vision of the world crepusculaire Mishima. In this book, Mishima expresses his disgust of modern Japan and the Westernization of Japan after the second war. Like the radical Islamists who perceive the Koran as the source of all knowledge and of all virtue, Mishima prone a return to moral values of feudal Japan, namely the feudal ethics. The Hagakure thus constitutes for him a kind of Bible. If the redundant tonalite all eventually bore the reader, the reading of this text will nevertheless a better understanding of the romantic work of Japanese writer.