Well, little one, when someone wants to visit another country, they usually need something called a visa. A visa is like a special passport sticker that allows someone to enter another country for a certain amount of time.
In the case of Japanese citizens, they usually need a visa to enter other countries, just like people from other countries need visas to visit Japan. However, different countries have different rules about visas.
Some countries have a special agreement with Japan that allows Japanese citizens to enter without a visa, or to get a visa very easily when they arrive. Other countries might require Japanese citizens to apply for a visa in advance. This means that Japanese citizens need to fill out some special forms, provide some important information (like their passport information, job information, and reasons for visiting the country), and sometimes pay a fee in order to get the visa.
The type of visa required can also vary depending on the purpose of the visit. For example, if a Japanese citizen wants to go to a country for tourism, they might need a different type of visa than if they were going for business or to study.
So, in summary, Japanese citizens usually need a visa to enter other countries, and the rules for getting a visa can vary depending on the country and the purpose of the visit.