Looking for MMA/Kickboxing gym

So I'm looking for a place to start training again, preferably some place with open mat sparring that I could just walk into. I had a couple places back in the US on various days of the week that I could just go in an do some light/technical sparring and leave. No membership required, just good times and good people. Are there any gyms like that here in Osaka?

by MamoruK00