According to my experience, working for more than one year is not necessarily, and working visa is not necessarily more than three years. The dependents are required to have a formal job and income and a certain deposit. Although the monthly income and deposit amount are not specified, it is recommended to have at least 6,543.8+0,000 yen deposit. Besides, there is no need for a guarantor at home.
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Back to high school friends:
This condition you mentioned is relatively safe, but it is a sufficient condition and an unnecessary condition. For example, if you get 60 points, the conditions you describe may be 80 points, and I may describe 60 points; They both passed the exam. Of course, the higher the score, the safer it is, but 60 points is also satisfactory in whether it is qualified or not.