Japanese Teachers of English Wanted

There has been an offer for me to teach English. The new job will start in 2018. Do you know why I have been selected? I am Japanese. That's right. The job condition specifically demands the instructor to be Japanese. This is a case of discrimination. If someone decides to hire someone else based on the person's nationality, it constitutes a case of racial discrimination. Racial discrimination usually works against me, but not this time. Should I be thankful?