It is one week until X-day.
Determined to negate the crimes that occurred 18 years ago, Satoru invites Hinazuki to the Science Center so she won’t be alone. However, her mother refuses to let her go. But then Sachiko shows up and thanks to her intervention, Hinazuki is allowed to go with Satoru. At the center, he recalls having the same conversation with her 18 years ago. Satoru suspects that he’s riding the same pre-Revival rail of time, and before he knows it, X-day has arrived…