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After the girl woke up, she found herself lying on the ground next to a strange teaching building. When she was confused, a passerby, codenamed "Zero", told the girl that she had entered the Academy of Angels. At first, she was in a state of half-belief. In her later attempts, the girl also believed that this was the academy in the afterlife, thinking that she was dead in reality. She made many friends in this world, and listened to them chatting about their experiences in life, which made her understand a lot of truth...