This book is to help the student examine Kajukenbo's relationship to Judo in the Hawaiian lineages of martial arts, and to also explore the claim of James Mitose that Kenpo was the secret method of Atemi in Kodokan Judo. If this is true, this would make the lineage of the Official Self Defense club, coming from William Chow to Sijo Adriano Emperado a lineage of Judo teaching methodology with Atemi as it was once taught in Japan and the Kodokan itself. This is important for not only historical purposes but for those going back to our roots. Kenpo was originally developed as a preferred method in Hawaii for street self defense because Japanese grappling was common knowledge amongst street fighters. Changes in the Judo world would lead to Kosen Judo leagues, and later Brazilian Jujutsu which expanded on ground technique that was removed from Judo competition gradually until rule changes in 1925 formalized the type of competition Judo is commonly known for today. The goal is to present a comprehensive view of Hawaiian Kenpo and Kajukenbo formulating its street self defense by people already aware of Japanese grappling and its ground submissions, which influenced its philosophy and technique. Judo provides a link to both the development of technique in modern submission grappling and systems of Samurai era Ryu prior to the Meiji period in Japan. The presence of Professor Henry Seishiro Okazaki taught both Kodenkan Danzan Ryu Jujutsu and Kodokan Judo, leading to the creation of Professor Wally Jay's Small Circle Jujutsu. It is important to understand the approach of classical Jujutsu and Kano's Judo, and how the combative concepts and teaching methods are reflected in Kajukenbo itself. These principles are not only inherited from Sijo Adriano Emperado, but included is information attributing the take down and strike method combining Kenpo and Judo to Great Grandmaster Joe Emperado. This together can be considered "Emperado Method Jujutsu" within Kajukenbo. Many are today learning and innovating these same principles to submission grappling on the ground. It is for this reason material related to Judo Atemi, and its possibly secret applications passed down through William Chow is examined as well as the research ideas on the lost principles of Atemi in both Judo and Aikido by Kenji Tomiki. Along the way is examined many facts of historical importance such as the writings of S.K. Uyenishi who claims that both Kenpo and Shime-Waza were once there own arts in Japan. Also explored is the relationship of Kenpo in Okinawa and Karate, and if they too were separate arts, and if this was the reason that William Chow took Kenpo Jujutsu and formed his own system of Kenpo Karate, before creating Kara Ho Kempo. Hawaiian Kenpo systems with a connection to Chow, are known for their speed striking, and that this method was created with fighting grapplers in mind. This work also asks the question, is part of this development related to the circumstantial evidence that Chow may have fought and knocked Masahiko Kimura in Hawaii before he ever went to Brazil? Thus we take the reader on a journey of Kajukenbo, from Judo to Jujutsu.