Between War and Humanity

Karou is a 17 year old, high school student in modern day Japan. The country is under civil war. One day when she was walking home from school, she saw two people fighting with Japaneses swords. She ran home, but did t tell a soul. The next day, a new student was introduced to the class. It was the same boy. What will she do? Well... READ AND FIND OUT! I M NOT GONNA TELL YOU!