If ISIL kill the Japanese hostage, many countries become the enemy of ISIL.
This time all countries of the world are very angry against ISIL's action not only Asia but also U.S.A. Europe. Middle East. Africa. South America. Oceania.
If ISIL kill the Japanese hostage, all countries begin to do the big sanction.
ISIL must know the power of the big sanction.
Release the Japanese hostage now.