After training , both of them visit Soun Tendo , Genma 's friend from a long time ago and his fighting partner for martial arts . Upon returning to Japan , the pair settle in the dojo of Genma 's old friend Soun Tendo , a fellow practitioner of Musabetsu KakutÅ RyÅ `` or `` Anything-Goes '' school of martial arts which Genma passed on to Ranma . Genma and Soun agreed years ago that their children would marry and carry on the Tendo Dojo .