It's very interesting to me that you're writing on the subject of Peruvians emigrating to Japan, and the choices they make in either staying there, or eventually returning home.
I find it interesting because there is a parallel dilemma taking place in my country, the United States, with regard to the issue of people entering illegally and then establishing new lives here. The United Staes government has ignored this issue for many decades, such to the poin that it's almost impossible to rectify it now. In your research, I assume you're studying legal immigration, based on what little I know about the strictness of Japanese laws of soverienty and the sense of nationalism.
As can be expected, there are very stringent viewpoints both for and against the issue of illegal immigration here in the US. In 2007, there are millions of people form various countries all over the world who have settled in the US after having broken the law to get here. A lax policy on deportation helped create a culture that has grown in size and political strength.
From the 1960s to the early 1980s, US immigration laws and immigration enforcement was so weak that people didn't consider them an obstacle to entering the US, or to re-entering after leaving. For many thousands of those people, the original plan was to seek gainful employment, work for a few months or a few years, and then return to their home countries. A vast majority of the jobs available to them were in the agricultural sector, an industry that soon came to rely on this labor pool. Some people had a revolving plan of going back and forth from their homes to the US every year, following the planting seasons and the harvesting seasons.
In the mid 1980s, there were immigratiom reform laws that gave illegal immigrants the opportunity to apply for legal status by proving they had been in the country for ten years, and paying a fine of $1000 to the Immigration Service. The idea was that those here illegally would register, and eventually, the problem would decrease. Bad plan. What happened in reality was that hundreds of thousands more people flocked to the United States in anticipation of also receiving these benefits. The requirement to prove ten year's residency was a joke, because so many illegal immigrants use false names, that all they had to do was buy receipts and paycheck stubs from someone else. In effect, these people were being rewarded for breaking the law. The good life in the United States became even better, for some people.
Soon, the Immigration Service was deludged with applications, which caused more of a back-log in their already beleagured system. The $1000 per applicant didn't not make up for the numbers of employees it now took to process them. And since even more people were coming forward, the problem increased exponentionally. A curious developement also began to emerge: now that they had a degree fo legitiamcay, they had less fear of retribution for breaking other laws. The mindset seemed to be, "If the US goverment says it's ok for me to break immigration laws, it must be ok to break any law I wish to break." The law enforcement community faced a paradox: the same government that employed them to protect our citizens was now excusing illegal behavior.
When the television news announced that the deadline for the amnesty program was drawing near, even MORE people entered the US illegally, eager for their chance also. Next, since these formerly illegal aliens now had a chance to get legal US residency, they invited more of their family members and friends to join them. Although there were plans to stay ashort while and go home together, this hardly ever took place. These immigrants were here to stay.
The family units began to get larger and larger. Men were bringing in their wives or girlfriends from home, and soon their children followed. As they established roots in the US, they began to have children here. Most of the children were fluent only in their parents' language, but soon, that started to change. As the years went on, more of these children were American, with no knowledge or connection to their parents' homeland. Ten years after the amnesty program began, illegal immigration had not slowed down, it had increased.
By the late 1990s, the steady flow of people was still strong, and hardly anyone was leaving the United States. Life was too good in the US , compared to their home countries, and after all, they had plenty of company, with their own language, customs, traditions, food, etc.
The immigrant problem continued so much that they began demanding that Americans adjust to them, not them adjusting to life in America. School districts were being sued for not offering classes in foriegn languages. City governments had to print documents and street signs in foreign languages. Companies had to hire people that could communicate with immigrant communities.
Maybe you can see some similarities between our crisis and what's happening in Japan.