Ouyang Song is a junior high school student with mediocre grades. Her mother ignored her after she remarried, and her father disappeared from her world. But one day, he was led into a strange secret room by a black cat, and strange and outrageous things happened like a flood. At the same time, he also met a strange girl-Lin. This is not her real name, but a code name. During the conversation with Lin, she learned that Lin would be killed when the fireworks started at the school event celebration, and Lin was trapped in an illusion. The only way to escape from the infinite loop was to find the murderer, so the two began to search for the murderer in the infinite loop. But there are too many secrets about Lin. Perhaps, this cycle journey is not just about finding the murderer and rescuing Lin. What is the real reason and purpose of the cycle...
Mission: Everyone will find true salvation and happiness in life