Down an alleyway in the heart of Tokyo, there is an underground café that's been serving carefully brewed coffee for over a hundred years. Legend says that this coffeeshop offers its customers the chance to travel back in time. The rules, however, are not simple: you must sit in one particular seat at one particular time of day. You can't venture outside the café, nor can you change the present. And, most importantly, you have only the time it takes to drink a hot cup of coffee-or risk getting stuck forever.