After we have consulted with 'M&A Advisory of the visa documents' and 'Khonkaen Immigration bureau of the visa renewal' for him.
The Immigration bureau informed us that, Mr. Kurosu's visa can renewal 45 days before the expired.
So the visa of Mr. Kurosu will be expired on 14th Janualy 2016, he should be renewal for it in December of year 2015.