Health Care System
If you are fully employed by a Japanese firm, the company will cover the health and pension insurance. (JP: shakai hoken)
If you are self-employed than you can join the national Japanese health insurance. (JP: kokumin hoken)
To register into the health insurance visit the local city hall. Depending on your duration of your stay and your health condition foreign-health insurance might be more reasonable. But not all hospitals accept foreign insurances.
If you rent a flat in Japan often it is mandatory to sign up a householder's insurance policy. Further we recommend casualty insurance. Your national casualty insurance of your home country might not be applicable in Japan.