This world is shrouded in all kinds of weird rules. The protagonist wanders into it by mistake and must strictly abide by the weird rules of specific scenes (such as hospitals, schools, apartments) in order to survive. For example: "After 12 o'clock in the evening, if someone knocks on the door, they must first ask 'Who are you' three times. If the other party does not answer, you must not open the door."
