✔ 最佳答案
Do you mean the paper in public lavatory?
mmmmm difficult to say, because it depends always.
Fast food restaurants, shopping malls, department stores and 7-11 style convenience stores usually have it. They even don't have any key protection. Hotels, city halls and/or public buildings are same.
If you go into some public lavatory at local train's station or deserted park or street, it might happen that you need to prepare it by yourself. Even more, you need to squat there as old Japanese style. It is still better than local China.
However still, mostlty speaking, Japanese public lavatory usually has the vending machine selling handy tissue paper so that you need to prepare two or three 100Yen coins for convenience in your pocket always just in case though.
Btw, there are so many people who's gonna hand you out free handy tissue paper as promotion of goods on busy street or in front of crowded train station in Japan. You can keep it for the accidental use outside of your home.