Learn more about “Sogo Goshin-Do,” WATER KARATE DEFENSE ARTS on our online karate video channel. SOGO GOSHIN-DO is a synthesis of mixed Martial Arts combined to specifically meet the needs of each and every person. No matter your age, size or weight is, this style of karate is custom-tailored for you. Karate icon Kyoshi Will Marvin, former Olympic competitor, Shichidan (7th degree black belt) and Soke of Sogo Goshin-Do, teaches the principles of Self-Defense in an easy and understandable way.