The book reveals the secrets of the technique of Daito-ryu Aikijujutsu - a famous and popular style of martial arts. It is a continuation of the books: "Daito-ryu Aikijujutsu: Martial Art of Samurais", "Daito-ryu Aikijujutsu: Hiden Mokuroku - Nikajo", and "Daito-ryu Aikijujutsu: Hiden Mokuroku - Sankajo". It describes in detail the methods of Hiden Mokuroku - Yonkajo (the fourth group of base techniques of the Daito-ryu school). The book contains a large number of illustrations with a detailed description of the features of the style techniques and it will be useful for everybody who studies martial arts.Contents: Introduction Yonkajo techniques Ura Gote Uchi Gote Kakae Kubi Temakura Zume Wakidori Omote Wakidori Ura Irichigai Tatsu Maki Izori Ura Otoshi Senryu Waki Zume Otoshi Kasumi Nage Hadaka Jime Daruma Gaeshi Conclusion