Kikokushijo is a Japanese term that means "returnees" in English. When parents move to another country, they may take their children with them. If those children were born in Japan and move to a new country, they are called kikokushijo when they return to Japan.
Imagine that you live in Japan but have to move to a different country with your family. Let's say you move to the United States. You go to school in the United States and make new friends. Maybe you learn to speak English fluently, and you become accustomed to the American way of life.
Eventually, your family has to move back to Japan. When you return to Japan, you might feel a bit strange because you have spent so much time away. Your lifestyle and way of thinking might be different from your Japanese friends. People might ask you questions about America or speak English to you because they assume that you still do not understand Japanese very well.
These experiences are what kikokushijo go through. They are children who have lived abroad for some time and then return to Japan. While this can be a challenging experience, it can also be a unique advantage. Kikokushijo have the opportunity to explore different cultures, gain linguistic skills, and develop an international perspective that can benefit them in their future lives.