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Old Man Gengai's latest invention: the "Time Machine." The Yorozuya members and a bunch of others who tagged along for some reason have used it to time slip into Guest's past. Of course, Guest has no idea!! Now, just what kind of past did Guest have...? No one knows yet. Not yet. A message from Old Man Gengai: How to return: Gintoki just needs to press the "Return Button" to come back from the past. Precautions: Do not take any actions or say anything that might change the future. You must not meet Guest. People in the past cannot see Gintoki and the others, but they can hear your voices, so be careful.