Almost no one in Japan owns a gun. Most kinds are illegal, with onerous restrictions on buying and maintaining the few that are allowed. Even the country’s infamous, mafia-like Yakuza tend to forgo guns; the few exceptions tend to become big national news stories.
Handguns are forbidden absolutely. Small-caliber rifles have been illegal to buy, sell, or transfer since 1971. Anyone who owned a rifle before then is allowed to keep it, but their heirs are required to turn it over to the police once the owner dies.
The only guns that Japanese citizens can legally buy and use are shotguns and air rifles, and it’s not easy to do.
If Japanese people want to own a gun, they must attend an all-day class, pass a written test, and achieve at least 95% accuracy during a shooting-range test. Then they have to pass a mental-health evaluation, which takes place at a hospital, and pass a rigourous background check, in which the government digs into their criminal record and interviews friends and family. Just don’t forget to provide police with documentation on the specific location of the gun in your home, as well as the ammo, both of which must be locked and stored separately. And remember to have the police inspect the gun once per year and to re-take the class and exam every three years.