Period up to 1 year
As of July of 2012, was introduced the special re-entry permission system. Foreigners holding the zairyu card will not be required to apply for re-entry permission when leaving Japan, as the new system allows people to leave and return to Japan within the 1 year. But if the person does not return to Japan within the 1 year period, he will lose the visa.
If your visa has a period of stay of less than 1 per year, the period of your return to Japan will be until the visa expires, otherwise you will lose your visa.
Period above 1 year
When foreigners residing in Japan provisionally leave the country and wish to return to Japan with the same stay (visa) qualification, re-entry must be requested in advance.
If you leave Japan without a re-entry permit, your stay qualification (visa), which you had prior to leaving Japan, will be canceled. On the contrary, if you leave Japan with the re-entry permission, you do not need to apply for a new visa.