A month of seminars, a handful of principles | Seishinkai A History and Style Guide of Aikido E-Open International - Kata - Randori - Nihon Taï Jitsu Aikido: Principles of Kata and Randori is a fully illustrated research guide for students of aikido, and includes step by step explanations of the four major katas of aikido, an in depth technical discussion of off balance and control principles utilized in both kata and randori, as well as a detailed discussion of the underlying physical and... Money Back Guarantee ensures that buyers receive the item they ordered or get their money back.