If it were possible to go back to the past, which aspect of life would you change? The café located in a secluded alley in the suburbs of Tokyo has been serving customers coffee for over a hundred years. However, along with enjoying delicious coffee, visitors here have the opportunity to gain a unique experience, traveling back in time. Four travelers, some of whom may want to speak with a departed sweetheart, while others wish to see their little sister one last time. One person wants to talk to her husband who is afflicted with Alzheimer's. Meanwhile, someone longs to see their child's face just once. But this method of time travel is not entirely without its risks. They must remain seated in a specific chair the entire time and cannot step outside the café. The most crucial point is that they must return before the coffee gets cold. Welcome to this world of science fiction filled with greed, desire, longing, regret, and sorrow.