Can't international students apply for national health insurance in Japan? . Or later?

In the future, international students need to show their health insurance certificates when they apply for visa renewal. Without health insurance, they will not get visas.

Even if you pay it later, the marketing office has a record of your landing time, which will let you make up all the previous arrears.

Therefore, it is best to apply for health insurance as soon as you land in Japan. If you have a headache, it's cheaper to see a doctor.