Japan doesn’t have socialized medicine. They havle universal care. The government pays 70%.
So the payment for healthcare is socialised. In low income households the government waives the 30% copay. Everyone is covered by law and fees are set by the government. All hospitals must be run as non-profits.
Guns are not banned but heavily restricted.
Handguns are completely banned which are the type of gun used in most crimes in the US. Rifles and shotguns are heavily restricted.