What if the Japanese visa expires?

1. Leave the country before the visa expires. Don't get dark in Japan, or you will have trouble getting a Japanese business visa in the future.

2. When you leave the country, tell the border guards that you don't intend to go back to Japan, and give the login card to the border guards to write "single out" next to your passport and visa. This means that your visa is invalid. If you go to Japan again in the future, you will have to apply for a visa again.

If you haven't decided whether you want to go back to Japan in the future, you should extend your visa first and go through the re-entry procedures for multiple trips. Then you can leave the country.