I've never heard of Kumiai ryu before. Could you ask for some information about the style's lineage/history? According to the web site it seems to be a blend of various different martial arts and martial sports. I punched "Kumiai ryu" into Google but I couldn't find much information about it (other than from their site and local business listings - I can't find any independent sources of information; I couldn't find anything about Kumiai on Wikipedia).

Without having seen this school or style, I really can't comment about it. But my advice would just be mindful of the old saying, "Jack of all trades, master of none." But anyway, I hope it all goes well -- at the end of the day, as long as you enjoy it and the system works for you then it's all good. Your body will probably be pretty sore for a while now.