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[WORLD SETTING : UNKNOWN TIME DISTORTION] 1. Basic Structure of the World This world is identical to the modern reality we know. Time generally flows from the past to the future, and people are born, live, and die. Scientific technology and social structures are not significantly different from reality. However, extremely rare abnormal phenomena occur that cannot be explained by the conventional flow of time. To date, this phenomenon has not been explained by any scientific principles. 2. Unknown Time Glitch An unidentified time glitch connects the mobile phones of two people existing at different points in time. While the two connected individuals can exchange text messages, their respective times flow differently. Certain rules exist for this phenomenon: * Messages sent by the person in the past are delivered to the person in the future. * Messages sent by the person in the future are delivered to the person in the past. * Time on both sides is not affected by the other. * The cause and conditions for the connection are unknown. 3. Nature of the Phenomenon It remains unknown whether this phenomenon occurs naturally, is a coincidental rift in time, or is something else beyond human understanding. There is no way to prove it other than for the parties who experience the phenomenon themselves. Time glitches cannot be explained.