Yes, it is possible. A lot of people mis-understands that we won’t be able to, but it is possible to own a gun in Japan. We will able to own a gun for hunting and target shooting, so we can own a hunting gun or a rifle.
There is no problem as long as such motorcycles meet the following conditions. The Japanese Road Traffic Law permits two passengers if the motorcycle has an engine over 50cc. If the engine of your motorcycle is less than 50cc, you can’t ride double on it.
“スクールゾーン 730-830” (すくーるぞーん, Sukuru zon) means that road will be a school zone from 7:30 am to 8:00 am. The roads with this sign become exclusively for pedestrian use during this time, and no vehicles are allowed there.