In Tokyo, there's a little coffee shop, old-fashioned, unpretentious, but with a startling secret. In the Funiculi Funicula café, under the right circumstances, if you follow the rules, you can travel in time.
The rules aren't complex, but they must be followed exactly. You can only time travel in one chair in the café, and you can't get out of that seat while "traveling." That chair is normally occupied by a ghost, and only once a day, when she gets up to use the bathroom, can you sit there and "travel." You can only meet someone in the past who has visited the café.
Oh, and you need to finish your coffee--and return to the present--before the coffee gets cold.
