Please Forget Me Before the Rainstorm

"They are not dead, they have been deleted by the 'world'. They will be formatted together with them in your memory." On a rainy night, I discovered that my dead classmate never existed in the classroom surveillance camera. The head teacher pointed at the empty seats and scolded me for hallucinating due to stress. But the next day, three people disappeared. Late at night in the old laboratory building, the radio automatically plays the rules: [Hide and seek begins, please hide. When the countdown sounded in the darkness, I tightly covered the mouth of the girl next to me. Don't make a sound. The seventh tones are not our people.