At a TIME-OFF train station, a couple who used to be in love decides to break up and go in different directions. One goes to the past, another goes to the future. When the memory is erased, they fall in love with each other again. However, the last train is coming. If they don’t leave, they will be left in the GAP of the Time. In this mezzanine, they could not hear each other's voice, let alone touch each other. What little choice they will make?