There are two kinds of Japanese visa: one is what is based on job or other causes, and the other is what is based on human relations like family.
Except for permanent residence visa, visa has validity period. Once it is expired, you will become an illegal foreign national. However, even when you have overstayed, there are some cases that the Minister of Justice may grant special permission for residence. The cases are as follows
- When you have married with a Japanese person
- When you need to raise children in Japan
- When you have already stayed in Japan for long term
As each of you have different circumstances and recently Immigration Services Agency of Japan deal with this matter strictly, it would be better to ask an attorney who is familiar with records of trials and judicial precedents. Of course, I can also deal with your case. I am now working tackling these immigration cases in cooperation with overseas lawyers and NGO like the Philippines, Turkey, and other Asian countries. It is very helpful to claim overseas social situation why you have to stay in Japan.