I was playing through Shenmue today and came across a very interesting piece of dialogue with Ine-San the morning after you learn of the Tattoo parlor on Disc one.
Apparently I was under the impression that Ryo's father Iwao was his only martial arts teacher since it's a Hazuki Tradition, however Ine-San mentioned that a "karate instructor" (specifically karate and not Jujitsu) by the name of Nonaka-san had called and said something along the lines of Ryo missing MA practice and that he would like him to show up more often to Karate school. This is really confusing as not only that but she said that Ryo's teachers had been calling him to talk about how they're worried about him...
This seemed to happen to me if you constantly stay out past curfew, although I'm not sure if it might come across as standard 'chit-chat'. I suppose this would explain the trophies in Ryo's closet if he had been competing in Karate tournaments with the institute, but I was always (as I'm sure most of you are) under the assumption that Iwao was Ryo's only Sensei since I'm sure his Jujitsu training would eat up alot of time for this new Karate training.
Just an interesting piece I thought I would share with you guys. I'm not sure if Nonaka-san has a profile or has ever been mentioned in previous discussions.