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On December 23th, a blizzard day. A boy named Kamoc was in chemistry class. Suddenly, a shotgun sounded loudly. All of the students in his class wondered what had happened. When he saw outside, he found a lot of armored men surrounding the school. After that, a bomb exploded and his classroom was filled with tear gases. It was difficult to run but everyone ran away to live. Fortunately, all seemed to escape safely but Kamoc found his childhood friend named Dovibo missing. He worried about her. A phone call from someone unnamed, who said