Unless the jumper is under the age of majority the family are not responsible for the debts of the deceased in any country I know of.  Is it different in Japan? See <a href="http:&#x2F;&#x2F;www.nidirect.gov.uk&#x2F;what-happens-to-debts-when-someone-dies" rel="nofollow">http:&#x2F;&#x2F;www.nidirect.gov.uk&#x2F;what-happens-to-debts-when-someon...</a> for instance.