Liu Xiaozhai, an ordinary female high school student in this world, unexpectedly encounters a black cat who travels through the Ming Dynasty and possesses Si Guangyan, a girl from the soul tribe who lives in seclusion in Jingting Mountain. Suddenly the black cat appears again, transforming into a handsome man named Ran Qiju, and tells her that Si Guangyan and she once fell in love here in her previous life. But Liu Xiaozhai cannot remember anything about Ran Qiju. Liu Xiaozhai returned to the living world and entered the high school where Liu Xiaozhai attended. Ran Qiju's character was changeable, and he was stable only in front of Liu Xiaozhai. Gradually, countless strange things happened in front of Liu Xiaozhai: ghosts, elves, gods... At the same time, his friends, classmates, and even strangers he had only met once would disappear or be killed inexplicably. Her peaceful life was broken, and she began to doubt Ran Qiju around her... But the truth was the cruelest truth after all... The moment Ran Qiju left, she painfully realized that she had really fallen in love with the god of death.