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As the heart beat abnormally, the black knight girl from thousands of years ago woke up. She held my hand, and I don't know where she will take me... Eighteen years ago, a black meteorite fell from the sky. Xianglun happened to be born on that day, so he had been weak for many years and had little magic power. From that day on, a strange black stone entered Xianglun's heart. Later, as the heart beat abnormally again and again, things that did not belong to this world were summoned one after another. That knight girl is one of them.