Only Japanese decendants are citizens, you CAN NOT gained citizenship in Japan, it can only be given at birth by your Japanese parents.
All others are VISITORS/ TEMP. RESIDENTS. And are treated accordingly in society. (HIIJIME they call them, a special treatment for non-Japanese)
Their passport is branded differently, their ID notes their Korean decendancy, etc.
Is this discrimination? What does citizenship means in Japan? Why does this not outrage international community?